All overview
1.Aluminum Oxide.
2.Good quality with resaonable price.
3.Grits from16#-1000#/
4.For wall.Metal.Wood.Stone.etc.
16# -120# these grits are used to sand outer walls
180#-1000# these grits are used to sand internal walls
Mainly polishing and grinding the surface of board and metal, piano board, leather, automobile, stone etc. Velcro disc with holes is better for the strips go out, so the work pieces can be harmed and there is no pollution
Benefit
1)Excellent cut rate
2)High poshing efficiency
3)Resists clogging during use
4)Extended life,less downtime
5)Good grinding surface polishing