Tattoo Needle Configurations and Tapers: A Guide to RL, RS, M1 and RM
Choosing a tattoo cartridge involves several specifications: needle configuration, count, diameter and taper. For tattoo brands and distributors, understanding these differences helps create a clear, well-organized product range.
At CREDITECH MED, all cartridge styles can be manufactured with RL, RS, M1 or RM needle configurations to match your product specifications. You can select the cartridge design that fits your brand, then define the needle options within that product line.
This guide explains four common configurations and three taper categories, with examples of how they can be incorporated into an OEM or private-label cartridge range.
Four common tattoo needle configurations—RL, RS, M1 and RM—illustrated with short, medium and long tapers.
Understanding Needle Configuration and Taper
Needle configuration describes how individual needles are arranged within a grouping. Taper describes the sharpened section of each individual needle, extending from the full-diameter shaft to its point.
These are separate specifications. RL identifies a round liner grouping, while ST, MT or LT describes the taper used for the individual needles in that grouping.
| Specification | What it describes | Examples |
|---|---|---|
| Configuration | Arrangement of the needles | RL, RS, M1, RM |
| Needle count | Number of needles in the grouping | 3, 5, 7, 9 and more |
| Diameter | Thickness of each individual needle | 0.25 mm, 0.30 mm, 0.35 mm |
| Taper | Length of the sharpened section | ST, MT, LT |
For tattoo brands, defining all four specifications makes it easier to compare samples, organize SKUs and communicate product differences.
Explore our standard tattoo cartridge needle collection to see the cartridge designs available for your range.
RL — Round Liner
Round Liner needles use a circular arrangement with closely grouped tips. They are commonly selected for outlines, lettering and detailed linework.
An RL label alone does not determine the finished line width. Needle count, individual needle diameter, grouping tightness and working technique also influence the result.
When specifying an RL cartridge, define the complete grouping rather than relying only on descriptions such as “fine liner” or “bold liner.”
Product Example: SP3 Standard Tattoo Cartridge Needle
SP3 is one of the cartridge styles available for developing a private-label liner range. It can also be manufactured with RS, M1 or RM configurations, allowing brands to offer multiple needle options within the same cartridge design.
SP3 cartridge shown with a round needle tip. RL, RS, M1 and RM configuration options are available for production.
View SP3 Standard Tattoo Cartridge Needle →
RS — Round Shader
Round Shader needles also use a circular arrangement, generally with a more open grouping than round liners.
They are commonly used for shading and filling smaller areas where a relatively compact grouping is useful.
Although RL and RS can look similar in simplified diagrams, their tip arrangement is an important distinction. When evaluating samples, compare the grouping geometry alongside needle count and diameter.
Product Example: SP4 Soft Grip Tattoo Cartridge Needle
SP4 offers another cartridge design for building a coordinated product range. A brand can specify RL and RS options within the SP4 line, then extend the assortment with M1 and RM configurations as required.
The soft grip design provides a distinct product appearance, while clear SKU labeling helps customers identify the needle specification inside.
SP4 soft grip cartridge shown with a round needle tip. Needle configurations can be selected to match your product range.
View SP4 Soft Grip Tattoo Cartridge Needle →
M1 — Weaved Magnum
M1 needles are arranged in two staggered rows, creating a wider working area than a compact round grouping.
Weaved magnums are commonly used for broader shading and color filling. Needle count, diameter and spacing affect the dimensions of the grouping, so these specifications should be considered together.
When comparing M1 samples, confirm both the needle arrangement and the overall working width.
Product Example: SP5 Soft Grip Tattoo Cartridge Needle
SP5 can be manufactured with M1 needles as part of a shading and filling assortment. The same cartridge style also supports RL, RS and RM configurations.
This allows brands to build a range around one preferred cartridge design and distinguish each specification through packaging and labeling.
SP5 shown with a round needle tip. M1 and RM versions use the corresponding tip and needle assembly.
View SP5 Soft Grip Tattoo Cartridge Needle →
RM — Curved Magnum
RM needles use a magnum arrangement with a curved tip profile. The outer tips sit slightly back from the center, creating a rounded working edge.
Curved magnums are commonly selected for shading, blending and tonal transitions.
Depending on the manufacturer, similar configurations may be labeled RM, CM or another abbreviation. A reference drawing or approved sample helps confirm the intended geometry.
Product Example: SP6 Modular Tattoo Cartridge Needle
SP6 is another option for brands developing a cartridge assortment that includes curved magnums. Customers can choose the SP6 design and define the required RM specifications, alongside RL, RS and M1 options.
SP6 cartridge shown with a round needle tip. The cartridge style can also be manufactured with RS, M1 or RM configurations.
View SP6 Modular Tattoo Cartridge Needle →
ST, MT and LT: What Do Taper Labels Mean?
The comparison chart illustrates each configuration with three taper categories.
| Label | Full name | Description |
|---|---|---|
| ST | Short Taper | A shorter sharpened section |
| MT | Medium Taper | An intermediate sharpened section |
| LT | Long Taper | A longer, more gradually narrowing section |
For the same needle diameter, a longer taper creates a more gradually narrowing point.
Taper is separate from needle diameter, needle protrusion and working depth. A long taper does not automatically mean a smaller shaft diameter, and it does not specify how far the needle extends from the cartridge tip.
Taper labels can also vary between suppliers. For OEM development, record the actual taper length in millimeters rather than relying exclusively on ST, MT or LT.
For a closer look at these specifications, read our guide to tattoo needle diameter, taper and point finish.
Choosing a Cartridge Style for Your Brand
A product image shows one version of a cartridge, rather than every configuration available for that style.
The product photos in this article show round-tip examples. For other configurations, the cartridge is manufactured with the corresponding tip and internal needle assembly.
This gives brands the flexibility to select a preferred design and build a coordinated assortment around it.
A practical development process starts with five steps:
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Choose the cartridge style that fits your intended product line.
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Select the configurations needed for your assortment.
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Define needle counts, diameters and taper lengths for each SKU.
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Evaluate representative samples and approve the final specifications.
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Finalize packaging and labeling so customers can identify each option clearly.
A focused range with well-defined specifications gives distributors a clearer catalog and helps artists compare products more easily.
Our tattoo cartridge packaging customization services can help you present those specifications consistently across the range.
What to Include in an OEM Tattoo Cartridge Inquiry
A detailed inquiry helps turn a product idea into a sample plan.
When contacting CREDITECH MED, include:
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Preferred cartridge style or reference image.
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Required needle configurations.
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Needle counts and diameters.
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Taper preferences or exact taper lengths.
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Grouping requirements, such as liner tightness or magnum curvature.
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Branding and packaging requirements.
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Estimated quantity for each specification.
If your assortment is still being developed, share your target customers and the types of products you want to offer. These details provide a useful starting point for discussing samples and customization.
You can also explore our tattoo cartridge manufacturing capabilities to learn more about CREDITECH MED.
Frequently Asked Questions
Can I order different needle configurations in the same cartridge style?
Yes. All CREDITECH MED cartridge styles can be manufactured with RL, RS, M1 or RM needle configurations. Each SKU is produced according to its selected specification.
Do the product photos show every available configuration?
No. The photos in this article show round-tip examples. M1 and RM versions use the corresponding cartridge tip and needle assembly.
Does long taper mean a smaller needle diameter?
No. Taper describes the sharpened section of the needle. Diameter describes the thickness of its shaft. Needles with the same diameter can have different taper lengths.
Is long taper always the best choice?
There is no single taper that suits every application or working preference. Evaluate the complete specification and compare samples for the intended use.
What should I confirm before approving an OEM sample?
Confirm the cartridge style, configuration, needle count, diameter, taper length and grouping geometry. Packaging details and SKU identification should also be checked before production approval.
Build Your Private-Label Cartridge Range with CREDITECH MED
A clear product range begins with a cartridge style that fits your brand and needle specifications that meet your customers’ needs.
CREDITECH MED provides OEM/ODM tattoo cartridge manufacturing for brands and distributors. Choose your preferred cartridge design, define the configurations and specifications, and develop an assortment with clear product differences.
Send us your preferred cartridge images and needle specifications to discuss samples, customization and packaging.
Visit CREDITECH MED to explore our products and contact our team about your OEM/ODM project.