cleaning method 1. Soak about 5 ~ 8 minutes 75% alcohol. 2. Using ultraviolet light for disinfection for about 45 minutes. -Comes with a transparent protective box to hold the Tink Roller.Caution - Do not pull the Roller into the skin, just use gentle pressure. -Skate obliquely at the same intensity, covering the same areas in both directions (vertically and horizontally). -The roller cannot be reused as the needles will remain sharp for a long time. Javemei - Not suitable for the following skin conditions: active acne, eczema, rosacea, peonosis, server solar caratosis and raised moles or warts. -Keep out of the reach of children.