be used in the last process in grinding and polishing automotive ; have dust clogging, high grinding 1.Good flexibility.2.Water the sandpaper is used in the last process in grinding and polishing automotive ;dry and wet sandpaper, have dust clogging, high grinding and long life.backing: PE Film+ velcro / PSADimension ( diameter):4"(100mm), 4.5" (115mm),5"(125mm),6"(150mm),7"(180mm)Grit range: 40 ...