Kingdom Abrasive Pro-Net Sanding Discs have the most advanced sanding technology on the market, Pro-Net combines high performance and 10 times lifespan than traditional sanding discs, making it a cost effective solution. Each Pro-Net disc 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 disc to remove any build up. The 34 Pack also include a free premium pad protector (a $5 valve) with strong holding feature between Pro-Net and Pad for easy attachment to popular sanders. When used with our Multi (52) Holes Premium Long Hook Velcro Pad (2QSD62D) with a vacuum sander, dust Collection is INCREDIBLE. Pro-Net is ideal for sanding wood, metal, plastic and solid surfaces.