PneumaticPlus Anti Vibration Rubber & Cork isolation pads, Pack of 4 (3" X 3" X 7/8") 4 pack of Anti Vibration pads Rubber & Cork 3" x 3" x 7/8" 50 PSI max load Applications are endless.... Air Compressors, HVAC, Stereo Equipment, Treadmills etc etc Designed for Indoor & outdoor applications Alternate Rib Height for Additional Vibration Isolation Under Both High and Low Weight Loads Designed to Resist Aging, Compression Set, Water & Oil