Features: 1. Size: 32*12*2cm,The material has great thickness, it is durable. 2. Sponge filter provide both mechanical and biological filtration,Trap large bits of waste,And will not get clogged easily. 3. Can be cut to fit your filters.Used for any aquarium or pond filter. 4. Bio Sponge Filter Media Pad is aquatic pet safe and are made without dyes. Suitable for freshwater or marine aquariums 5. Regular cleaning! can be reused after cleaning. Specifications: 1. Material: Sponge Caution: 1. Pleasec clean the sponge first before you put them into your aquarium.