Premium Quality: These pool robot bag cleaning bags are woven from nylon with strong stitching and tights. Fabric and weaving materials are the same as Polaris 280/480. Can hold all kinds of debris: leaves, insects, twigs, sand and mud, difficult to damage. Easy to Use: Extra - Wide zipper opening makes it easy to empty and clean the filter bag. Easy to remove and install velcro fasteners, can be removed in seconds for cleaning. Perfect Fit: This universal filter bag features very sturdy velcro fasteners designed to #39;Snap securely onto the pipe cleaner and seal tightly at the top. The secure closure ensures total reliability. Better Compatibility: Works effortlessly with Polaris 280 and 480 All Purpose Saddle Bags (Parts K13 and K16). Not compatible with Polaris 360 and 380 pool cleaner models. You will receive 4 packs of strong and durable vacuum cleaners. Number of parts supplied: 4 luckymeet p>