Auralex Acoustics Studio Monitor Isolation Pads, 1 Pair (MOPAD) 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 4" wide x 1" thick with 100 pound 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