Features: High Efficient Aquarium Sponge Filter: The fish tanks sponge filter adopt fine high density sponge can perfect provide mechanical filtration and increase water quality and oxygen rate underwater, good for fish, shrimp, create healthy aquarium environment. Low Noise Sponge Filter: The aquarium sponge filter with air powered, simple put the sponge filter with fully water absorbed and sink to the fishtanks bottom, start to work with low noise which suitable for small fishtank & household aquariums. Selected Material: The sponge filter use qualified plastics material & fine sponge, nontoxic, tear & wear resistant, bring effectively filtration & aeration for your aquarium, fish tanks. Variety Air Pump Compatible: The aquarium sponge filter could applicable for various air pumps(NOT included), no-limitations of air pumps rate power, convenient and energy saving. Durable Aquarium Air Pump Accessories: The aquarium sponge filter with durable material, 3 optional size to choose, which fit for variety size fishtanks, oviposition hatching tanks, shrimp jar, can meet your daily requirements, fine sponge filter for small aquariums. Specifications: Product Dimension: approx. Small 6x6x7.5cm/2.36x2.36x2.95inch, Medium 10x10x10cm/3.94x3.94x3.94inch, Large 13x13x16cm/5.12x5.12x6.3inch Material: Plastics, Sponge Style Option: Small/Medium/Large Package Includes: 1 x Aquarium Sponge Filter note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.