Check the listing for details. Kwadron Cartridge Round Liner Needles - Box of 20. Condition: New. Listed at 33.50 USD. Kwadron Cartridge Round Liner Tattoo Needles - Box of 20 Kwadron has developed a strong reputation for manufacturing one of the best cartridges on the market using the highest quality materials available. The outer housing is produced with a medical grade plastic which greatly reduces the friction between the needle grouping and the tip. Each surgical stainless steel needle configuration is consistently produced using razor sharp, flexible needles, grouped together with the highest precision. These new cartridges have also been engineered with a unique style stabilizing system that ensures optimal performance. They also include a membrane style system which provides ample protection against ink back flow. Features: Needle stabilizing system Precise needle configurations 0.35mm diameter needle Membrane style system Medical grade plastic Exceptional ink flow Surgical stainless steel E.O. Gas Sterilized 20 Cartridges Per Box