The 4PC For Dolphin Replacement Filter Panels Part Number 9991432-R4 are compatible with Dolphin pool cleaners and are designed in a rectangular shape. Made of durable plastic material, these filter cartridges are suitable for hot tubs, above ground pools, and in ground pools. The set includes four filter canisters in a black and white color scheme, offering a quick and easy solution for keeping your pool clean and crystal clear. With a manufacturer warranty of 1 month, these filter panels are a reliable choice for maintaining your pool or spa's water quality.