comes with 540 titanium alloy needles of various diameter (0.25mm to 2.5mm) for effective operation and is made of ABS for good durability. It can be used for hair regrowth treatment as well as an anti-aging solutions and various treatment uses depends upon your needs. The information presented below will not only make your skin supple but also rejuvenate your complexion! Collagen is a protein produced by the skin. This Derma Roller provides the skin with smoothness and elasticity. Collagen production decreases with age and weaken the skin structure. This leads to fine lines, wrinkles, scars or stretch marks. If you are looking forward to improve your skin conditions permanently, your body must produce collagen.Activator is a handheld device with 540 Titanium Alloy 0.5 mm micro needles. When used with topical tonics and oils on the scalp, it boosts blood circulation and boosts absorption scalp absorption, improve efficacy. All this for faster results!