1.Aluminium Oxide 2.Good quality with resonable price 3.grits from 16#-1000# 4.For Wall, Metal, Wood, Marble, Stone,etc 16# , 36# , 40# , 40# , 80#, 120# these grits are used to sand outer walls, 180# , 240#, 320#, 400#, 600#, 800# , 1000# these grits are used to sand internal walls, our box size is 180*125*185mm, 100 pieces of one box. Abrasive Paper