Nanofibers make clean up a snap. Easy on/off design. Designed to combat your toughest challenge, the Ultra-Web Cartridge Filter can be used for both wet and dry pick-up. Fits full size vacs. Approximate size of cartridge: 8" diameter and 6.5" high. 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.