Kwadron Optima Universal Needle Cartridges Our Kwadron Full safety membrane needle cartridges are compatible with our Mast Pro Wireless Tattoo Pen, a premium quality rotary style permanent makeup pen and most popular rotary tattoo machines, including FK Irons and Cheyenne models. Kwadron tattoo needles are known for being precisely made with high-quality materials for optimal performance. Kwadron Optima PMU cartridge tattoo needles are designed for precisely accurate permanent makeup tattooing. Kwadron Optima PMU cartridges also maintain the great qualities of the original Kwadron cartridges. Tattoo optimally with Kwadron’s unique stabilizing mechanism and membrane-style system that protects from ink back flow. Kwadron cartridges are also made of medical grade plastic housing, which helps reduce friction between the needle grouping and the tip. The surgical steel needles are razor-sharp and designed with utmost precision for every configuration. 20 Kwadron Optima PMU Tattoo Needle Cartridges per package Specifications: Medical grade plastic cartridges Surgical stainless steel needles Precise needle configurations Optimal ink flow Engineered with unique needle stabilizing system Membrane style system protects against ink back flow Needle Diameter: Varies in size Long Taper (LT) = 7mm Medium Taper (MT) = 6mm E.O. (ethylene oxide) gas sterilized Designed for permanent makeup tattooing Compatible with most rotary tattoo machines Price per one box of 20