About this itemPoseidon cartridge adopt a one-time joint design hygienic standard The material is stainless steel and easy to color,and has better ink flowThis tip is made of a special material, which makes needle be worked stablyEach Cartridge is Sterilized by EO Gas & Independent Blister PackingPoseidon cartridge needles are compatible with all standard cartridge grips & machines100% satisfied or fully refunded! provides a replacement or refund for ALL products. No reason needed, smooth and simple!›See more product details