acoustic ar t wallpanels design by amsell berlin Dots is a sound absorbing wall panel. Materials: Frameless peat fiber moss, 100 % natural and ecological material with extremely good acoustic propertys (sound absorption class A) or aPerf is Frameless acoustic panels, made out of 25-aPerf® toxicologically harmless, mostly recycled polyester, 100 % recycable and nonallergic. Standard sizes: 60 x 60 x 4 cm Both materials are available in customized sizes, a wide range of color and pattern combinations.