... 5mm, 0.22X1.0mm, 0.22X1.5mm, 0.22X2.0mm Dermaroller needle1. Size: 0.22X0.2mm, 0.22X0.5mm, 0.22X1 ... , 0.22X1.5mm, 0.22X2.0mm2. Definition: The dermal roller is the best and most effective device for deep transdermal ... of scales. The mico-needles only push them aside, forming tiny mico-pores. While the dermal roller over the skin the ... acts like a longterm depot to retain the active substance derma roller