[Fitness] - Aquarium Bio Sponge Foam Filter Replacement Compatible with FX4, FX5, FX6 Canister Filters [Application] - Fx4 Foam Filters are suitable Compatible with both freshwater and marine aquariums [Function] - These Compatible with filter sponges trap micro-particles as water passes through. Provides efficient water flow with less clogging Compatible with long-lasting filtration. Helps maintain a healthy environment Compatible with aquatic life [Contains 12 Pcs Foam Filters] - Filter sponges should be replaced every 6-12 months as micro-holes gradually clog with debris, reducing filtration efficiency over time [Easy to Use] - Easy to install and fits directly. This is a non-aftermarket part designed Compatible with matching and functioning correctly Color: White Material: Sponge Package Contents: 12 x Fx4 Foam Filters Only the above package content, other products are not included Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the actual item. The measurements may vary by +/- 1-3 cm