The hair growth roller compose of microneedle which stimulates hair growth, achieve longer and thicker hair even in stubborn areas, rejuvenate your scalp, reactivate the natural regeneration, improve bald spots. microneedle skin care focus on innovation, inject new impetus into beauty. the principle of microneedle is to open the stratum corneum channels that hinder skin absorption of various skin care products. for example, we can only absorb a part of the skin when we apply the essence, and the skin care products can be absorbed better by introducing it with microneedles. it has a small, ergonomic deign painless and safe to you. features: improve scar, stretch marks, acne, etc. promote blood circulation and stimulate the collagen production. improve elasticity of skin. ALL SIZES AVAILABLE. 0.5mm, 1.0mm and 1.5mm. Send as message now!