Perfect After-sales Guarantee - We are committed to providing the best products and services. If you have any questions, please feel free to contact us. All problems will be solved within 24 hours. Safety Membrane - The cartridges system is equipped with a silicone safety membrane to prevent ink from passing through to the tube or tattoo machine. The cartridge needles are compatible with all standard cartridge grips and machines. The close mouthed tips design can make the needle strike more steady. Easy To Use - Unique design, filling in the inks easily, stable needle discharge, large ink absorption and strong ink storage capacity. Allows artists to set up needles and switch needle configuration very quickly during process. Compatible with standard pen machine and cartridges grips. High Quality Material - Made of 316L surgical stainless steel and high grade plastic. The transparent tip body makes it easier to observe the striking, and the bar design is more advanced, allowing the tattoo needle to contact skin without blind angle. Cartridge Kit - Comes in 40pcs. Pre-sterilized with EO gas and individual packaged in blister pack. These cartridge contain the most commonly used sizes, including 1203RL, 1205RL, 1207RL, 1209RL, 1205RS, 1207RS, 1207M1, 1209M1, and 5pcs for each size.