GENOSYS Vibrating Roller is detachable with GENOSYS Replacement Heads. The handle vibrates to maximize its effect and also eliminates the sensation of needles. The handle is not water-proof or washable. Clinical and medical rollers (0.50mm or longer) have 450 needles per head. The needles are made of stainless steel (medical grade) and diskneedle design guarantees 100% safety during the procedure.