1RL vs. 3RL vs. 5RL Needle Cartridges: How to Choose
The needle-count number on a round liner cartridge — 1RL, 3RL, 5RL — tells you exactly how many needles are grouped together, and that number is the single biggest factor in how fine or bold a line the cartridge produces.
Elite Permanent Makeup & Cosmetology College has trained licensed PMU artists in Los Angeles since 2012 and is licensed by the California Bureau for Private Postsecondary Education (BPPE). Last reviewed: August 2026.
Quick answer: 1RL is a single needle for the finest, most precise lines and hair strokes. 3RL groups three needles for bolder lines and small filled areas. 5RL groups five for larger-area coverage and denser lines. More needles means faster coverage but less fine-line precision.
Side-by-side comparison
| Cartridge | Needle count | Best for |
|---|---|---|
| 1RL | 1 needle | Fine precision lines, hair strokes, detail work |
| 3RL | 3 needles | Bolder lines, eyeliner fill, small shaded areas |
| 5RL | 5 needles | Larger-area coverage, denser bold lines |
Why needle count changes the result
A single needle (1RL) can only deposit pigment along the exact path it travels, which is what makes it the tool for fine, controlled work like individual hair strokes or precise line edges — but it also means more passes are needed to cover a larger area, and each pass is more localized trauma to the same line of skin. Grouping needles together (3RL, 5RL) covers more surface area per pass, which speeds up larger or bolder work but sacrifices the single-needle precision.
Matching the cartridge to the technique
Individual hair strokes and fine detail work call for 1RL. Eyeliner work often combines cartridges — a 1RL for the precise lash-line edge, then a 3RL or 5RL round shader to fill in density. Bolder outline work or larger-area coverage is where 5RL earns its place. See our full guide to needle configurations, including shaders, in Round Liner vs. Round Shader vs. Flat Shader.
Frequently asked questions
Which cartridge is best for a beginner PMU artist?
1RL is a common starting point for learning line control, since a single needle gives the clearest feedback on hand pressure and stroke consistency before moving to multi-needle configurations.
Can I use 3RL for hair strokes?
It's possible, but 1RL is generally preferred for the finest, most natural-looking individual hair strokes since a single needle produces the thinnest line.
Do I need all three cartridge sizes in my kit?
Most active PMU practices keep at least 1RL and 3RL on hand, since fine detail and bolder line work both come up regularly; 5RL is added as larger-area work becomes part of your service menu.
Does needle diameter matter as much as needle count?
Yes — diameter (commonly in the 0.25–0.35mm range) affects how fine or bold the deposited line looks independent of count, so check both specs when choosing a cartridge.
This article is educational information for licensed PMU professionals.