Functions: Rejuvenates skin, promotes pores and skin elasticity, will increase skin thickness. Reduces appearance of cellulite, stretch marks, and large pores. Stimulates hair growth, improves thinning/balding hair areas. Process will not be painful (its only a tingling sensation). Can be used on all areas of the face, neck and body and scalp. Can be used by yourself anytime at your personal convenience. It stimulates dermal healing ability. With no side effects, it's safe and reliable,The best choice for anti-aging,anti Wrinkles,cell regeneration,hair regeneration,acne, scars,body Slimming,cellulite Feature: Simple to use Safe procedure Cost-effective Sealed and Sterilized. Needle length for you choose (0.2mm-3.0mm) Rolling Frequency: 0.2-0.5mm: 2-3 times a week 0.75-1.0mm: Once a week 1.5mm: Once every two weeks if used lightly, once every 3-4 weeks if used more vigorously. 2.0-3.0mm: Once every five weeks (Note: Use the Needle again only after the previous wound is all healed up.) Remember that collagen production takes several months of skin needling before you see any real difference. Have patience and results will come. Important Information: 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. package list : 1 pcs Derma Roller Stamp Microneedle