Description: Features: brand new and high quality. It is the best partner for pump. Instantly create a great deal of tiny bubbles that your fish will love. The tube can be cut with a for razor blade to be shorten. Additional bubble walls can be jointed with the enclosed connector. Rubber suction cup can produce enormous power to stick to glass surface firmly. Need to use a pin or needle to puncture for as many small holes as needed before using. 6 sizes for choice (total length): approx. 7"(17.8cm), 10"(25.4cm), 14"(35.6cm), 18"(45.7cm), 23"(58.4cm), 28"(71.1cm). Note: This item is air tube only. It needs to be connected with air pump to make bubble. Air pump should be ordered separately. Specifications: Item Name: Fish for Tank Aquarium Air Stone Bubble Wall Tube Material: Plastic and Rubber Color: Pink/Orange/Yellow/Fluorescent Green (Optional) Total length: Approx. 7" / 10" / 14" / 18" / 23" /28" (Optional) Tube Diameter: Approx. 1cm/0.39" Connector diameter: Inner diameter: 4mm/0.16" (Approx.) Outerdiameter: 6mm/0.24" (Approx.) Quantity: 1 PC (other accessories demo in the picture is not included) Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! 4.No retail package Package includes: 1 X Fish for Tank Aquarium Air Stone Bubble Wall Tube(No retail package)