4 in 1 derma roller set.Rotary head conversion model. More stable and convenient.Internal purge tank with fixed cylinder head position.Humanized anti-slip grip design.The micro-needles in the roller naturally stimulate the skin to produce an important substance called collagen which is important for healthy, youthful looking skin.Restore years to your skin. You will get a lot of compliments soon.Makes your skin look younger and healthier.It can be used on all areas of the scalp, face and body including fragile skin such as around the eyes, mouth and neck.Significantly increases the effectiveness and penetration of active ingredients in the topical preparation.Helps smooth fine lines and wrinkles.Helps reduce stretch marks, scars, cellulite and fine lines.Helps tighten sagging skin and dark circles.Improves skin texture and reduces pore size.Improves the skin's ability to absorb skin care products such as topical serums, creams, etc.