Materials: Abrasives: aluminium oxide, silicon carbide, zirconium oxide Bond:resin over resin Backing:cloth or non-woven Application: Button sanding polishing pad is rigid.It is suitable for strong grinding and processing for circle area.Non-woven lolishing pad is so rigid and flexible that endure kibbled resistance and heavy duty.The flexibility of unique netted structure make it contacted with working surfaces evenly and not scratch workpieces,It is used for cleaning,grinding and polishing of workpieces. 尺寸Size:Dia50mm,Dia75mm,Dia100mm