Waterproof Hook & Loop Sanding Discs are made of high quality silicon carbide and waterproof sandpaper. Hook & Loop Sanding Discs are comparable to Velcro™ sanding discs, they prevent clogging, anti-static, good flexibility, wear resisting, that provides outstanding life and superior finishes. It's more effective used wet because clogging is reduced by particles washing away from the grinding surface. It can be used for mold surface precise sanding, and also in stone, lacquer surface, mirror surface treatment such as headlamps polishing. Waterproof sanding discs can be used for dry sanding too, it's more suitable for high-precision polishing than red grain and white dry sanding discs. Waterproof Hook & Loop Sanding Discs, 2" - 6" are available with or without vacuum holes.