This derma roller from the house Kostech comes with 540 titanium alloy needles of diameter 2. 5 mm for effective operation and is made of ABS for durability. It can be used for hair regrowth treatment as well as anti-ageing solution. To obtain result, cleanse your face or any area that needs treatment with warm water and use the derma roller 2 times per week/10-15 minutes. Apply moisturizing cream or serum after derma roller therapy to help keep your skin moisturized. Apply it several times to calm your skin and to avoid skin irritation. It will be suitable for users who have combination skin type and medium skin tone. It is recommended to keep away from children for added safety. The package contains one derma roller.