The BondiBoost powerful derma roller is guaranteed to help with hair loss and encourage hair growth. Made with 540 high strength medical grade stainless steel needles (1.5 mm in size), this roller is designed for premium performance. When in use, the needles create “micro-injuries” in the skin and follicles, releasing growth factors to stimulate new cell production. This encourages the growth of new hair, giving you a fuller, thicker head of hair. With regular use, you’ll see a noticeable difference in your hair, ultimately stronger and healthier overall.