3 reasons to work with sustainable cartridge 1. Less skin trauma 2. After healing, the color is warmer 3. You can work at lower speeds, which makes it possible to make better shading. Hard membrane cartridges require higher speeds (higher voltage) BITECH cartridges with a soft and elastic membrane are ideal for any devices When working, they leave a soft puncture and an even date. Device on the video iColor fly #icolorpmu #icolorbitech #icolorpigments #icolorfly #permanentriga #pmulondon #pmuberlin #pmuköln #pmubrows #pmubelgium #pmuhungary