... regeneration:1.0 1.5(used for solutions of thin epidermis,thin wrinkle,decline of elasticity,etc)3) For the antii-ageing&rejuvenation ... 2.0(used for solutions of thick wrinkle,large pore,injury scar,pimple scar,severe decline of elasticity,etc) 3,How to ... use:Follow 3 steps of needling to enhance forming channelsHorizontally-vertically ...