flap disc 4 1/2 inch: grinder flap disc assortment containing 10 pieces of each grit: 40/60/80/120 grit, total 40 pieces. According to different grit size, the surface of workpiece can achieve different gloss effect. Premium High Density flap disk, assortment grits will meets most of your polishing and welding work, the grinding wheels compatible with most 4.5” angle grinders. Resin-bonded Aluminum Oxide Flap Discs The flap disc is made of aluminum oxide, designed for high speed sanding and heavy duty removal, delivering fast and long lasting cut. Angle grinder flap disc is bonded with fiberglass backing plate effectively absorbs vibrations with little stains during usage, bringing more stable, more reinforcement. This flap wheel is wearproof, antistatic, antic logging, the robust construction of the discs ensures they won't break or fray easily, the consistent performance allows for smooth operation and extended tool life. Grinding discs are used for weld blending, deburring, edge blending, surface conditioning. Applied on rust, paint, ferrous, stainless steel, non-ferrous metals, wood and plastics. In order to facilicate the use of customers ,we have upgraded the packing and attached the brand label into the flap discs. You may also get the package without label.