... hardness,adjust by changing the pcs of pads in each Flap wheel,and can also increase the ... hardness by chemical treatment.non-woven abrasive brush roll/buff/grinding wheel/abrasive/abrasive paper/flap disc/ ... METAL WARE,DIECASTING,PLASTIC,LACQUER,WOOD.USED EXTENSIVELY IN MANUAL,SEMI_AUTOMATIC AND AUTOMATIC MACHINES.FOR FINE AND ... MORE UNIFORM AND HOMOGENEOUS FINISHING polishing sheets in roll