The NEW cartridges have a structure made of polycarbonate with surgical steel needles and a silicone grip with double cuts at the upper ends to prevent rolling. They are easy to install and fit most pen-style machines. They have a durable silicone membrane that prevents ink backflow. They are individually packaged and sterilized with EO GAS. They minimize vibrations and are sterilized with E.O. Gas. They are suitable for dynamic use for different types of tattoos and adapt to the tattoo artist's hand. • Box of 20 pieces • Sterilized with EO Gas • Thickness: 0.25mm, 0.30mm, 0.35mm • Needles: 1, 3, 5, 7, 9, 11, 14, 18 • Silicone Grip • Long Taper