?GREAT QUALITY MATERIAL - Medical grade PC material shell, More safety than the PVC material. The needle is made of Japanese standard medical stainless steel, with sharp needle points and neatly arranged. Fast rebound, piece needle allows for maximum stability and control. ?NEEDLE STEADY - Cartridges come with close-mouthed tips which can make needles strike more steadily. Filling in the colors is easy, dipping the machine needles into a small pot of color or filling color into the upper opening of the cartridge. ?EASY TO FILL COLOR - The needle cartridges allow artists to set up needles and switch needle configurations very quickly during the tattooing process. The round liner needle adopts a funnel-shaped design, which stores more ink, and the ink discharge is very uniform, without ink jetting, tattooing longer lines. ?STERILIZED NEEDLES - To ensure the safety of the needles, Our cartridge needles are produced in the aseptic workshop and packed after disinfection, and 100% sterilized by E.O. Gas. ?UNIQUE MEMBRANE DESIGN - The unique silicone membrane design allows the needle to be closer to the needle tip and increases stability, and prevents the backflow of ink can better protect your machine. Low noise when tattooing. The cartridge needles are compatible with all standard grips and machines.