... beauty, body slimming, hair regeneration, and effectively for skin anti-aging.II. Production Specifications* Roller Body: diameter 20mm X width ... 5mm ( use for solutions of thin epidermis, thin wrinkle, decline of elasticity)For anti-aging& rejuvenation of ruined skin1.5, 2.0, ... 2.5mm ( Use for solutions of thick wrinkle, large pore, ...