Key Features Soft Black Rubber Material Flexible, can be formed to any shape needed or kept as a 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 45cm 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 45cm Air Curtain to your Aquarium. Suitable for salt and fresh water use, these soft 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. Please Note The 45cm requires 1 air input. (Please see pictures for