Fits most wet/dry full size vacuums. Up to 5 times more efficient . For small, dry debris and wet materials like cold fireplace ash, auto refinishing, cement dust, sawdust, and drywall dust. Easy cleanup. Blue in color Designed to combat your toughest challenge, the Ultra-Web Cartridge Filter can be used for both wet and dry pick-up. The Ultra web cartridge filter fits most wet/dry vacuums. The ultra web filter is up to 5 times more efficient. For small, dry debris and wet materials like cold fireplace ash, auto refinishing, cement dust, sawdust, and drywall dust. It's easy on/off design, along with the nano-fibers make clean up a snap!