Dermapolin Dermaroller contains 540 micro needles. Each needle is 0.50mm long. Dermapolin Dermaroller needles are made of first quality titanium. Stainless. It does not cause allergies. You can use it safely for a year by disinfecting it with Dermapolin cleaning solution after each use. Where to Use: Suitable for use on face and hair. Areas of Use for Skin: Acne scars, Burn and scars, Skin blemishes, Acne scars, Acne spots, Fine Lines, Wrinkles, Cigarette lines on and around the lips, Loss of Elasticity, Enlarged pores, Under-eye bruises and bags, Wrinkles around the eyes, Decollete It is suitable for use on skin and birth stretch marks, areas with cellulite, and hands. When Used for Hair: It helps prevent hair loss when used regularly. Hair loss may exceed normal levels as a result of genetic factors, use of the wrong product, hormonal reasons, stress, seasonal changes, unhealthy diet and living conditions. Dermapolin hair dermaroller helps hair follicles strengthen and adhere to the scalp. It supports increasing the effect of the hair strengthening serum used together up to 600 times.