This is a 4 pack of pool filters Pleatco: PA126 | Unicel: C-7495 | Filbur: FC-1296 Diameter: 7" Length: 32 7/8" Top: Open Hole: 3" Bottom: Open Hole: 3" Filter Area: 126 sq ft Filter Material: Pleatco Advanced (4oz/yard) Alternate Filter Names: CX1260-RE | C-126RE | C5020 | Hayward Super-Star-Clear C5000 | Hayward SwimClear C5020 | 17-175-1348 | APCC7181 | 22506 | PA 126