Harmonic Resolution Systems Inc.
The HRS Damping Plate/Nimbus System incorporates a highly effective design to eliminate component chassis noise revealing a new level of musical performance. They are precision manufactured from billet machined aircraft aluminum and proprietary HRS polymers. A very specific amount of mass, stiffness and damping from these products eliminates chassis resonance problems and transforms residual chassis energy to heat. This is a special system utilized by audiophiles and industry professionals as their reference chassis noise reduction system. Available in black or silver. Price per each.

Damping Plate size- 4.5" x 5.5" x .07

check out the various sizes.