sponge sanding block Usage: For polishing and finishing Convenient, efficient, with good flexiblity and suitable hardness. For polishing complex surface of workpiece.various shapes can be customized sponge sanding block Convenient, efficient, with good flexiblity and suitable hardness. For polishing complex surface of workpiece. ( structure) ( shape) grit range backing abrasives coated structure max width waterproofness sheet belt roll disc Foam/ Sponge aluminium oxide or silicon carbide close coated good generally various shapes can be customized P60 ----- p400 We offer OEM service, welcome inquiry