Flap disc ,flap wheel, CHINA NO.1 PROFESSIONAL MANUFACTURER OF FLAP DISC 1. Diameter: 4'',5'',6'', 7'' 2. Grain: 40#-320# Flap disc, flap wheel/ abrasives disc/abrasives polishing disc ... /mop disc/1. Diameter: 4'',5'',6'', 7''2. Grain: 40#-320#3. Material :ZA A (alumina oxide )4.TYpe: T29 ... , THE SURFACE WILL BE MORE SHINE AND SMOOTH . ZA flap disc with ABS BACK SUPPORT