Safety material: please note that DIYARTS is only authorised by RuGaoStore. If you buy other stores, we cannot guarantee the quality. Thank you. This sponge filter is made of high quality plastic, durable and comes with an environmentally friendly sponge that does not harm the fish. Efficient filtration: cylindrical biochemical cotton has a large full filtration effect, no dead angle, can effectively filter harmful floating objects in the aquarium and adsorb harmful substances on the sponge, so that the aquarium water is clearer and more natural quality. How it works: the aquarium filter is powered by a ventilation pump. It can filter impurities through a sponge and convert them into substances that are harmless to fish and circulate them back into the water tank. It works without noise and does not disturb your everyday life. Easy to clean and install: simply connect the hose to the air pump, connect it to the filter, connect it and use it. All parts of the sponge filter are removable. Simply rinse the sponge and press it into the water tank. Widely used: this aquarium filter is small and easy to hide behind the plant. It fits in any corner and is ideal for shrimp tanks, rearing tanks, Betta aquariums, nano water tanks, turtle tanks, aquariums, goldfish, juvenile or other fish. Product description Size Name:16*8*6.3cm Specifications: Material: plastic + cotton. Colour: black. Size: Small size: plus plastic tube height 16 cm, diameter 8 cm, cotton body height 6.3 cm, cotton body diameter 8 cm. Medium size: plus plastic tube height 16.5 cm, diameter 12 cm, cotton body height 6.5 cm, cotton body diameter 12 cm. Large size: plastic tube height 21 cm, diameter 12 cm, cotton body height 11.5 cm, cotton body diameter 12 cm. Weight: Small: 177g, Medium: 260g, Large: 290g