Key Features Soft Black Rubber Material Flexible, cna be formed to any shape needed for kept as an eye catching wall Provides Decoration Opportunities, add bubbles to the back or sides of an aquarium or even create displays Adds Water Movement and Aeration to your Aquarium 60cm Length. Fits 4mm Air Tube. Suitable for Salt and Fresh Water Tanks Create a dynamic and visually pleasing display, along with providing water movement and aeration by adding a 60cm Air Curtain to your Aquarium. Suitable for salt and fresh water use, these rubber Air Curtains can be formed into almost any shape to create an impressive decorative wall of bubbles inside of your fish tank. Whether it is placed at the back of the aquarium to create a fantastic looking background or used as an additional decorative piece to your existing decoration, you can create visually stunning effects whilst adding oxygen and style to your fish tank.