INGVIEE Set of Compatible Aquarium Filter Foam Sponge for Juwel Compact/Bioflow 3.0 (4 x Blue Fine, 4 x Blue Coarse, 4 x Green Nitrate, 4 x Black Carbon)Custom made to fit the Juwel Compact Bioflow 3. 0 Specific dimensions in the following Product Description 4x Blue Fine, 4 x Blue Coarse, 4 x Green Nitrate and 4 x Black Carbon sponge in each package Absorb impurities to ensure the water crystal clear, Better biological filtering This is a INGVIEE filter replacement, made from the same material