Feature 1Used for aquarium water filtration, easy installation and easy connection to the filter inlet rod. 2Easy to wash, reduce the frequency of cleaning the filter. Keep your aquarium clean. 3Prevent the impurities from being inhaled by the filter, reduce the damage of the filter motor. 4Effectively prevent the small fish and shrimp in the tank from being sucked into the suction port of the filter. 5Made of sponge material, safe, nontoxic and healthy, high density, durable for long term use.Item Type: Filter SpongeMaterial: SpongeColor: BlackSponge Size: Approx.4x8cm/1.6x3.2in(D x H)Weight: Approx.36g~42g/1.3oz~1.5oz .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List20 x Filter SpongeNote1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.