BeautyWorx Derma Roller. -The 0.25 mm allows for safe use. -Many uses! Beard Growth, Complexion, Absorption of topical producs, etc. -Stay Safe and Effective. Our Derma Roller is sanitized completely and packaged safely before shipping, ensuring a safe experience for the customer. Make sure to follow the instructions on the box. -The BeautyWorx Roller can be used every other day, or as needed based on personal preference. -ALWAYS soak the Derma Roller in alcohol after use to keep the needles sterile. -It is recommended to use a new Derma Roller every month. We recommend researching all of the basics of Derma Rolling before purchg a Derma Roller product. If you are a male interested in beard growth, we recommend using the Derma Roller, and following with a Beard Growth Oil.