The abrasive material is diamonds embedded in a heat resistant resin. The pads are, therefore, “self-sharpening” and long-lasting. Velcro backing for easy mounting on grinders, polishing machines, satellite discs or delta sanders. The quality is high and, therefore, the life span of the pad is really long. Turtle Pads are professional pads that can be used by most people with great success. Depending on the desired end result and on how damaged the surface is you can choose from five different grits. Precautions The Turtle pads are approved for use on grinding machines with speeds up to 11.500 RPM, but please be careful not to overheat the surface. Move quickly over the surface and avoid applying excessive pressure. Overheating the surface could result in discoloration Can be used on handheld machines as well as mounted on satellite discs – like the iTOOLS Turbo Disc.