Suitable Tank: Less than 300LBrand New and high quality.Protein Skimmer use venturi protein separation.Dirt and waste substance collected in the top container.Components: suction cups, wood stone, and 49cm long tubing included.You need to use this skimmer with your existing pump ( pump is not included).Wood stone generates bubbles to separate protein and waste substance from your aquarium.Kindly Reminder:Both of 2 models are suitable for less than 300L fish tank.In order to achieve better bubbles generation, less than 5w pump is recommended.No need of cumbersome assembly, just attach the suckers to inner wall of fish tank and it works.colour:As shown in colorMaterial:plastic-4003Flow Rate: 600L/HCup Size:8*23cmWood Size (L*W*H): 5x2x2cm / 1.97 inch x0.7 inch x0.70 inch(appr.)Tube Length: 49cm/19.29 inch(appr.)Package Contents:1*protein skimmerOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.