This derma roller comes with 540 titium alloy needles of diameter mm for effective operation and is made of ABS for good durability. It can be used for hair regrowth treatment as well as anti-ageing solution. To obtain best 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 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. The package contains one derma roller.