Review on SilverStone EPDM Sound Dampening Foam - Best Noise Absorption Material with Superior Adhesion in High Heat (2 Pack SF01-NEW) by Marcus Barlow

So another commenter pointed out that these leaves are really big and I believe them. However, as they are designed to absorb sound inside a PC case, I should have expected this. Anyway, this is what I used to mute the audio between the keyboard board and the case. Works well and doesn't hear the dull ping you usually hear from a metal case. To be honest you could technically use it as a sound deadening material in a sound booth or room as these panels are large and somewhat dense. I have enough material for several assemblies of my PC's keyboard and case. if i really want to Recommended for keyboard and PC mounting.