Steel springs reduce vibration transmission most efficiently as performance improves with larger deflections. Minimum deflection is 0.75″ which increases with heavier loadings. Spring deflections are 2 – 6 times higher than the rubber products. Imf unhoused simple spring mount works best for indoor applications on lightweight equipment that does not have to be completely level and does not need to be bolted down. Max load 34-54 lbs. 2″l x 2″w x 2-3/4″h overall dimensions.