Key answer
Needle height should be selected with geometry, backing, skin area, intended cosmetic use, safety plan and market classification—not copied from a competitor.
Start with intended use
Define application location, user, wear time, instructions and appearance-focused claim direction.
Assess the whole array
Base, taper, pitch, density and backing influence handling and contact alongside height.
Prototype conservatively
Use staged screening, documented observations and product-specific safety and regulatory review before commercialization.
Editorial boundary: General cosmetic development information only. Verify the actual formula, product, method and market requirements.