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Use these "de-coupling" domes instead of cones or bearings for a highly detailed, natural, and more musical sound. Very effective under components on wood shelves. A thick layer of Herbie's grungebuster material on the flat side helps controls microphonics. Use dome-side-up or dome-side-down; either way delivers a very responsive, dynamic result. For all audio and video components of any weight. Great for loudspeakers on wood floor or carpet. Recommendation: three domes per component (for greater lateral stability: four). Excellent for use with loudspeakers on low-pile carpet (for deep carpet or rug, use carpet spikes). 1" (25mm) diameter by 1/2" (12.7mm) high.