Auralex Acoustics Mopad-XL Isolation Sound Damping Products, 12" x 8.75" x 2" Sold in pairs so they can accommodate many different sizes of monitors, including monitors placed horizontally A pair includes (4) base pieces and(4) angling wedge pieces Base Pieces are 12 long x 8.75 wide x 2 tall thick and 1 pair can support 200 pounds limitation Enhances sonic clarity of studio monitors by eliminating sympathetic resonances within the room Yields a tighter, more precise bass response while un-masking otherwise obscured higher frequencies