Features- Needle length: 0.2mm/0.25mm/0.3mm/0.5mm/0.75mm/1.0mm/1.5mm/2.0mm/2.5mm/3.0mm.- Material: medical-grade stainless steel (needle) and hard plastic (handle).- 100% brand new and high quality 540-Needles Micro-needle Roller Medical Therapy Skin Care Tool. - A common cosmetic procedure for treating many conditions by stimulating collagen and elastin Production.- Stimulate the collagen production.- Improve elasticity of skin. - Smoothen acne scars. - Promote skin rejuvenation and improve alopecia.- Mildly roll 10 times vertically and horizontally.- Can be used on all areas of the face,javemay. neck and body and scalp.- Can be used by yourself anytime at your personal convenience.- Different needle lengths have different usages:1. Home use: 0.2mm/0.25mm/0.3mm2. Clinical use: 0.5mm/0.75mm3. Medical use: 1.0mm4. Physician use: 1.5mm/2.0mm/2.5mm/3.0mm- Cleaning method1. Soak about 5~8 minutes with 75% alcohol.2. Using ultraviolet to disinfect for about 75 minutes.- Come with a transparent protective box for holding the TinkSky roller.Attentions- Do not force the roller into the skin but simply use mild pressure.- Roll obliquely at the same intensity covering the same areas in both directions (vertically and horizontally).- The roller cannot be overused as the needles will remain sharp for a prolonged time.- Not suitable for use onto the following skin conditions: active acne, eczema, rosacea, peonasis, servere solar karatosis and raised moles or warts.- Keep out of reach of children.