Features: The propeller design, to separate the waste from the water and collect it at the bottom. Water pumping and changing, filter impurities in water to make fish have a cleaner water environment. Silent operation, won't disturb your sleep. Connect air pump for use. Easy to disassembly and cleaning. If there are any problems, please contact with our store in time. We will give you a satisfactory solution. Specification: Item: Fish Tank Filter Material: Plastic Main Color: Black and Transparent Size Optional:67*160mm; 67*255mm; 67*350mm Note: Due to the different display screen and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Please allow 10-20mm measuring deviation due to manual measurement. Package Information: Package Size: S: 7*7*16.5cm; M: 7*7*26cm; L: 7*7*36cm Package Weight: S: 250g, M: 300g, L: 400g Gift Box Package Packing List: 1* Fish Tank Filter