Specificationmaterial: polyurethane foamsize:(l)*(w)*(h): 30cm*30cm/11.8\" x11.8\"thickness: 2.5cm /1\"color：AS the picture showsFeaturesthe sponge is non-toxic, tasteless and safetythe sponge is the best tool use for sound insulation, sound-absorbing.it can be used in sound recording studio, control room, home theater, ktv, and many other places.sound-absorbing sponge is base on sponge for further processing, noise can be absorbed beacause it is reflected in the sponge which do not spread outside.Package included:12 x foamsNotice:please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering.please understand that colors may exist chromatic aberration as the different placement of pictures.