The GRAMMA (Gig and Recording, Amp and Monitor, Modulation Attenuator) is an incredibly effective patented device that's used to float an amp or loudspeaker.

GRAMMA yields nearly total acoustic isolation, resulting in a purity of tone that has to be heard to be believed!

Quantity: (4) Risers Per Box

Dimensions: 23" long x 15" wide x 2.75" high

Weight Limit: 300lbs.

Related Items: Great Gramma - 2 Pack | Great Gramma - 4 Pack