Slimline 3D aquarium backgrounds are only 15 mm thick. The system consists of 3 different parts: A, B, C . These units can be combined in order to get the necessary length of your aquarium or terrarium tank. The decoration is produced in 5 colors: Basalt Gneiss, Red, Grey Gneiss, Alpenkalk and White Limestone and can be easily installed on to any back or on to the sides of the tank. We inspire from nature, so the rock design is extremely realistic.