LTWHOME 6 Inch / 15cm Coarse Pond Filter Foam Cube Block Pump Pre Sponge(Pack of 1)

has an off centre hole cut out (3.5" Diameter x 4.5" deep) - Coarse grade foam,Cuts Easy To Any Required Shape Package Include:1PCS 6" Inch Coarse Pond Filter Foam Good for freshwater & marine environments Traps Particles & Debris Enhances biological filtration, Manufacturer: Ningbo Haishu Huaxin Yicheng Trade Co.,Ltd