These Proxxon adhesive sanding discs are industrial quality all the way! At 240 grit with aluminum-oxide abrasive and resin bonding, they handle tough sanding jobs on wood, chipboard, fiberboard, non-ferrous metals, steel, plastic, cork, rubber, and minerals. The 250mm diameter (about 9 27/32 inches) fits Proxxon's TG250/E disc sander perfectly. The self-adhesive backing sticks firmly to your sander but peels off cleanly when it's time for replacement. Each pack comes with 5 discs plus a silicone film for storing used discs - genius for keeping your workspace organized. Proxxon is known for professional-grade tools, and these discs live up to that reputation. Whether you're polishing, deburring, or shaping materials, these discs deliver consistent performance without loading up too quickly. The resin bond stands up to heat buildup during extended use. Perfect for woodworking shops, metalworking, or any serious DIY project where you need reliable sanding performance. If you own a Proxxon TG250/E sander, these are the exact discs you need to keep it running at its best. Quality that makes a noticeable difference in your finished work!