Product Name: Filter cotton Thicken + high density Water permeability, high efficiency filtration: imitate plant fiber, less resistance to water, water permeability, effective filtration Resistant to rub wash, feel soft and flexible, repeated scrub is not bad, durable use Aquarium Filter Sponge Specification: 30x50cm( Thicken 2pieces/set) 50x60cm( Thicken 2pieces/set) T-15: 300cmx12cmx2m T-14: 600cmx12cmx2cm T-13: 300cmx30cmx2cm T-12: 600cmx30cmx2cm T-17: 100cmx12cmx2cm Package Include: 1 X Aquarium Filter Sponge