Slimline backgrounds are app. 15 mm thick. The 3 available segments can be combined in order to get the variations for almost any standard and non-standard aquarium and terrarium tanks in a simply natural style. Slimline is an inexpensive still high quality decoration as all ARSTONE products. Available in 5 colours: Basalt Gneiss, Red, Grey Gneiss, Alpenkalk and White.