Ceramic bond grinding pads with Velcro backing for polishing concrete and smoothing scratch patterns. Ceramic bonding strength is between metal bonding and resin bonding. Using ceramic grinding pads in between metal and resin grinding effectively remove scratch marks and reduce polishing time. 3 inch pads with #200 grit size, comes in a set of 3 pieces. Use wet or dry with floor grinding machines with Velcro attachment.