Generic Compatibility Description: This set of 4 sponge backing pad is suitable with 7800 dry wall sanders and most standard 9 inch hook and loop sanding discs for various sanding systems. Versatile Sanding Applications Description: Designed to work with a wide ranges of 9 inch discs and sanding tools, these pad are perfect for multiple sanding tasks on different surfaces. Sturdy Reinforced Construction Description: Featuring nylon strap reinforced foam padding, these backing pad ensures secure attachment and long lasting during intensive use. Quick Disc Change Systems Description: The hook and loop backing allows for fast and easy removal or installation of sanding discs, improving workflow efficiency. Package includes: 4Pcs 9-Inch Disc Sanding pad