CRAFT CARTRIDGES - THE PRACTICAL TATTOO NEEDLES IN THE MOST POPULAR CONFIGURATIONS -Patented safety membrane prevents blood from entering the grip and the associated cross-contamination. -Change needle configurations in a matter of seconds -100% control of the needle modules -19 different needle configurations for maximal artistic freedom -The tightness of the safety membrane in our cartridges complies with the requirements of the European standard EN 17169 Tattooing - Safe and hygienic practice. All Cheyenne products that need to be return for exchange or refund must be completely seal unopened in original condition for us to accept it.