1、The -Needle Roller can stimulate the growth of collagen, it is perfect for anyone to get smoother, firmer skin. 2、The roller also helps in the boosting of product absorption. You could pair the roller with your suitable skincare product or serum for maximum results. 3、Easy to use and can be used for any skin types. You could use it at anytime with the convenience and comfort at home. 4、With the ergonomic handle, the derma roller is easy and comfortable to use. 5、Needle length: 0.2mm/0.25mm/0.3mm/0.5mm/0.75mm/1.0mm/1.5mm/2.0mm/2.5mm/3.0mm are optional, can be used on different skin area. Suitable for home and professional use. 6、Great for both women and men. Men can use this product to stimulate facial hair growth.Features: The Micro-Needle Roller can stimulate the growth of collagen, it is perfect for anyone to get smoother, firmer skin. The roller also helps in the boosting of product absorption. You could pair the roller with your suitable skincare product or serum for maximum results. Easy to use and can be used for any skin types. You could use it at anytime with the convenience and comfort at home. With the ergonomic handle, the derma roller is easy and comfortable to use. Needle length: 0.2mm/0.25mm/0.3mm/0.5mm/0.75mm/1.0mm/1.5mm/2.0mm/2.5mm/3.0mm are optional, can be used on different skin area. Suitable for home and professional use. Great for both women and men. Men can use this product to stimulate facial hair growth. How to Use: 1. Clean your face and dry completely. 2. Apply suitable nutritional serum on the area of skin. 3. Gently Roll over skin about 4-5 times in vertical, horizonal and diagonal directions. 4. After rolling, reapply desired skincare product needed on the skin. 5. Clean the roller and put it back in the storage box. Specifications: Type: Micro-Needle Roller Material: Plastic, Stainless steel Color: Black+Purple Neddle Length: 0.2mm/0.25mm/0.3mm/0.5mm/0.75mm/1.0mm/1.5mm/2.0mm/2.5mm/3.0mm(Optional) Package Size: 16*5*4.2cm / 6.3*2.0*1.7in Package Weight: 90g / 3.2oz Package List: 1 * Micro-Needle Roller1 * Micro-Needle Roller