A54MTX: Resin Bond for light removal/blending.A80GFX: Latex Bond with finer grit for ultimate finishing.Multiple layers of cotton impregnated with abrasive grain and special bonding agents allow for the coolest blending and finishing.Special cotton formula minimizes loading on soft, non-ferrous metals like aluminum., Available in two bonding agents for use in many applications.Mandrel overhang "O" must always be the lowest possible. Maximum speeds given refer to overhang "O" equal to 1/2".