Features: 1 set including 5 pieces that you can replace regularly. There are 2 sizes to choose from, 15mm (I.D.) and 22mm (I.D.). brand new and high quality High quality of materials. Prevent small fish and shrimp from getting in the filter. Prevent sundries from getting into the filter so that extends the for time of the filter. This sponge is an accessory for aquarium filters, which plays a role in for protection for inlets. Package Includes: 5 Pieces Filter Sponge (S-15mm/L-22mm) Specifications: Material: Sponge Color: Black Style: S-15mm/L-22mm Size (Approx.): S-3.5x6x1.5cm/1.38x2.36x0.59in L-4x8x2.2cm/1.57x3.15x0.87in Weight (Approx.): 52g note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!