YASHANG EASY TO SET UP: Connect the tube to the air pump and connect it to the filter. Plug it in and it works. GOOD DESIGN: The sponge rib shaped design, increase oxygen, provides ideal location for bacterial colonization. APPLICATION: Great filter for bettas, angelfish, fry, goldfish, baby fish, shrimp, small fish, breeding tank. WORKS WELL: Sponge filters provide excellent both mechanical and biological filtration, works great. MULTI USE: Provide both aeration and filtration for your fish. Description: Size: 3.15*6.30*2.17in. Material: sponge. Color: black. Note: 1.Please allow 1-3 cm error due to manual measurement. Please make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Including 1 x Sponge Filter