Kingdom Abrasive Pro-Net Sanding Sheets have the most advanced sanding technology on the market, 5 discs each of 80, 120, 180, 240 & 320 grits. Pro-Net combines high performance and 10 times lifespan than traditional sanding sheets, making it a cost effective solution. Each Pro-Net sheet features a Non-Clogging net design coated in premium white aluminum oxide grit and work for both Wet and Dry sanding by machine or by hand, its true dust-free sanding characteristics result in a cleaner work environment, as well as a better surface finish. The Pro-Net design is easy to clean and reuse multiple times by simply shaking, vacuuming or rinsing the sheet to remove any build up. When used with a vacuum sander, dust Collection is INCREDIBLE. Pro-Net is ideal for sanding wood, metal, plastic and solid surfaces.