... ,0.3,0.5,0.75,1.5.2.0,2.5,3.0mm with CE derma roller for ... to a series of chemical reactions-----photon decomposition,photon oxidation,photon polymerization,photon sensitization,different wave length has different functions. 405nm ... operated close to accurate part of skin. 0.2,0.5,1.0,1.5,2.0mm Changeable tip2.specificationReplaceble derma ... ,0.3,0.5,0.75,1.5.2.0,2.5,3.0mm 3.Contact WayName:Paul HuMobile: ...