Excellent quality micro needle roller system. An effective anti-aging tool. Reduce the common signs of aging, such as wrinkles, facial sag, etc. Promote blood circulation and make your skin tighten, elastic. Effectively improve scar, stretch marks, acne, etc. Also can be applied onto the entire body. Made of safe material, friendly and harmless. No side effect on human body, please be assured to use. Rolling Instructions : 1. Wash your hands and the area to be treated thoroughly. 2. Wipe the skin and your hands with anti-bacterial gel (you can skip this step if you are using needle lengths of less than 0.5mm). 3. If you are using numbing cream, follow the manufacturer's instructions for use. Always remove the cream completely before rolling (you can use cotton pads soaked with alcohol to do this). 4. Rinse the derma roller under hot running water for a few seconds. 5. Apply skin care product, if using. 6. Whilst pulling the skin taut with your free hand, roll forwards and backwards over the area to be treated. Roll 8-10 times in each direction: vertically, horizontally and diagonally (forwards and back equals two rolls). Apply sufficient pressure for the needles to penetrate the skin to their full length. Lift the derma roller slightly after each roll - this will ensure that the needles create new micro-channels in the skin rather than going over the same ones repeatedly. 7. Wash treated area and dry with a clean towel or air-dry. 8. Apply skin care product, if using.After Treatment : There may be some bleeding immediately after rolling but this is superficial and should simply wash away. Your skin will be red after treatment; this is normal and will fade after a few hours. Wait at least six hours before applying make-up and/or perfumed products to the treated area. Avoid prolonged sun exposure for at least 24 hours after treatment. Disinfect before use: Never share your Derma Roller with anyone else, and do not use on children or animals. Not use on irritated or infected skin, fungal skin, active acne, rosacea, eczema, and etc. Be careful when rolling around the eyes. Do not use on the eyelids or lips. Keep the derma roller away from possible sources of contamination. Store it in its case when not in use.