Mini resin fibre discs are manufactured utilizing a multilayer, heavy duty vulcanized fibre backing, which is then covered with a resin bond coat specially designed to resist loading, glazing and grain stripping. This bond coat is then covered with mineral abrasive grains formulated for toughness and sharpness. Mini resin fibre discs are available in many different styles. Variances include diameter and attachment type (Type R or Type S).