Smooth and shape flat or curved surfaces with our convenient 4.5" x 5.5" sanding sponges. Suitable for all metal types including platinum, these sponges can be used wet or dry and can be folded or trimmed to fit into tight areas. Made of durable foam rubber that has been permanently bonded with aluminum oxide abrasive. Sold in packs of five Grits 1 each 100 180 220 280 400