Wet grinding pads 1.Diameter:3"(2.5mm thick) or 4"(3mm thick) ... #,300#,500#,800#,1000#,1500#,2000#,3000#4"3mmWet grinding pads is for curved surface and the small plane grinding and ... polishing.1)Flexible polilshing pads,also integrated grains with resinoid.2)Supply a better performance ... grinding process of the curved or polygon surface..... wet grinding pads