The Acu Lift Derm Roller is a hand-held tool fitted with 540 fine needles that is daily rolled gently across the face. The skin is barely penetrated but collagen and elastin production are stimulated in this micro- needling process that exfoliates and tones the skin. Facial Skin care products applied after the treatment penetrate deeper and more effectively. This is a personal at-home treatment tool and can be used for face or body. Body Roller is bigger in size and addresses larger surface areas for cellulite, stretch marks and better skin elasticity. Use on thighs, buttocks, arms, and abdomen. The longer you use it, the better your skin will look.