0.25mm needle length Exfoliation only. DIRECTIONS: 1. Sterilize roller in alcohol solution before and after each use. 2. Wash and pat skin dry. 3. Do not puncture skin but apply pressure. Roll back and forth in desired area for 4 - 5 times. Switch direction. 4. Apply moisturizer or repairing serum after use. 5. Use once a week for optimal results. 6. Replace roller once every 1 - 2 months if using frequently and store in plastic case. DO NOT USE: - On open wounds. - On acne or irritated skin. - Under eyes or on lips. - Discontinue use if irritation occurs.