ALUMINUM OXIDE(A/O) Waterproof sand paper Perfect waterproof technique ,oil resistant and flexible in actual use ... /Wet)) Sand PaperItem No.SA18010 Specifications:1) Backing paper : Awt,Cwt,Dwt,Ewt,Fwt paper.2) Grain : ALUMINUM OXIDE,SILICON CARBIDE etc ... : 230mm x 280mm,230mm x 230mm also Customized size,5) Bond : Resin over resin. 6) Packing: 5 pieces/envelop,1000 pieces ...