Hamiledyi Pre-Filter Sponge/Foam Set for Fluval Edge Aquarium Sweep Hose Tail Scrubbers Replacement for Sweep Pool Cleaner Fits Polaris Pool Cleaner Backup Filter Parts(Pack of 20,2 Sizes) Approx Size:large 2.8"(7cm) x 1.8"(4.5cm) x 0.9"(2.2cm) small 2"(5cm)x1.4"(3.5cm)x0.6"(1.5cm) Enhances biological filtration Good for freshwater & marine environments Provides efficient water flow with less clogging for long lasting filtration Package including:10*large prefilter sponge 10*small prefilter sponge