Specification Material Polyurethane FoamSize L W H 30cm 30cm 11 8 X11 8Thickness 2 5cm 1Color BlackFeatures Brand New and High Quality The sponge is non toxic tasteless and safetyThe sponge is the besttool 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 Soundproofing 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