This undergravel filter hides from view for maximum aesthetics. Safe for use in both freshwater and saltwater tanks. Material: Plastic Height: Approx. 32-51cm/12.6-20.08inch, Large Diameter: Approx. 2.2cm/0.87inch, Small Diameter: Approx. 2cm/0.79inch,Outlet pipe length: Approx. 4.2cm/1.65inch, bottom length: Approx. 5.3cm/2.09inch, hose head length: Approx. 54x0.5cm/21.26x0.2inch Made of plastic, bright and never release toxic substances, ensure the safety of fish and shrimp.