The Decision Framework Professional Artists Use
Choosing a cartridge is not guesswork — it is a deliberate decision based on the style, the area of the body, the client's skin type, and the machine being used. Here is how experienced artists think through the choice.
Step 1: Identify the Technique
- Fine-line linework: 1RL–5RL. The smaller the number, the finer the line. Use 1–3RL for single-needle micro-detail, 5–7RL for standard portrait outlines.
- Bold traditional outlines: 7RL–18RL. Larger liners deliver more ink per pass for thick, saturated black lines.
- Greywash realism: 9RS–14RS Round Shader or Curved Magnum — wide ink spread with soft edges.
- Colour saturation: 11M1–23M1 Magnum. Covers large areas quickly with full colour opacity.
- Geometric blackwork: 7FS–14FS Flat Shader for hard edges and solid fills.
Step 2: Consider Skin Type
Skin type significantly affects needle choice:
- Thin, sensitive skin: Use smaller needle counts. A 7RS instead of a 14RS. More frequent light passes rather than fewer heavy ones.
- Thicker skin (hands, feet, elbows): Larger configurations with a steeper angle to ensure full pigment deposit.
- Older skin: Avoid very small liners — skin loses elasticity and fine lines can bleed more easily. Use moderate-size liners at a slower pace.
Step 3: Match the Machine
Machine stroke length affects which cartridges perform best:
- Short stroke (2.5–3.5mm): Better for liners and detail — faster movement, precise control.
- Long stroke (3.5–4.5mm+): Better for shaders, magnums, and colour — more ink pushed per hit.
AXIS cartridges are membrane-equipped, meaning they maintain consistent ink flow regardless of stroke length — a key advantage when switching machines mid-session.
Step 4: Factor In Session Length
Needle cartridges degrade over time. Tips become micro-dulled after 2–3 hours of continuous use. For large-scale pieces, professional artists plan cartridge changes:
- Start the session: Fresh cartridge for the most detail-critical work (faces, lettering).
- Mid-session: New cartridge for large colour fills — a slightly dulled needle tears skin during saturation passes.
- End of session: A third cartridge if doing extensive background or cover-up work.
AXIS Quality Assurance
Every AXIS cartridge batch undergoes E.O. gas sterilization with integrated sterilization indicators on individual blister packaging. Manufacturing follows ISO 13485 quality management standards — the international standard for medical device manufacturing. This ensures every needle meets elite professional requirements, session after session.