... 540 LED Derma Roller CE Approval Free Sample L011(2013 hot 540 needles titanium)fashionable dermaroller micro needle / dermaroller-L011. Also, ... therapy uses a knead rod inlayed with 540 slender steel needles, regularly rolling in the places which need to cure, ... up50% improvement of needle's strength than a normal materialFeatures:Needles:540needles 2.Replaceable type wheel, the handle of a permanent ...