Mirka Backup Pad 3"x4" FINISHES These firm spongesare very versatile

These firm spongesare very versatile and work great for ordinary block sanding

High strength resin bonding for superior grain support

Add optional shelf spikes to minimize the surface area touching the painted/finished part

Consistent coating of aluminum oxide (VF 360) and silicon carbide (UF 1500

Fast disk replacements More holes - better dust extraction

Mirka Backup Pad 3"x4" FINISHES These firm spongesare very versatileBacking pads are essential accessories for sanding and polishing tools, designed to securely hold abrasives and attachments in place while providing the support needed for smooth, consistent results. Available in hook and loop grip or PSA (adhesive) compatible options, these pads ensure a reliable hold and added cushioning to help reduce vibration and improve finish quality. Replace as needed to maintain peak performance and sanding efficiency.