These aluminum oxide sanding discs additive in the resin to resist loading, anti-static, effectively reduce the dust blocking, outstanding in durability. Made from top quality fused alumina grain, delivering fast and long lasting sanding. Velcro backing, easy to stick to the random orbital sander, but will not fall off when installed in use. Suitable for most 6-inch random orbit sander. Specification: Material: aluminum oxide Grits: 220 Package Quantity: 100pcs Size: 6-inch No-hole Package Included: -100pcs x 220 grit