Adysun Abrasive 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 Backing: Foam/ Sponge Abrasives" aluminium oxide or silicon carbide Coated structure: close coated Waterproofness: generally Shape: various shapes can be customized Grit range: 60-400 We offer OEM service, welcome inquiry