Dimension: Dia:178mm,350mm or according to customer's requirement. Grain:Black Silicon Carbide,Aluminum Oxide,Zinc-Stearate Coated Coating Density:Close coated,Half Open Coated Cloth Backing:Paper Base(C/D/E/F Weight Paper) Cloth Base(X cloth). Grit Range:P24-P400. Punching Model:1 center hole,cross center hole or star(*)center hole according to customer's requirements.