Blue Sof Shoe shims are .020 in. thick, compress to .0175 in. and absorb up to .010 in. of angularity|Can be used on motors, pumps, generators, turbines and other plant machinery in minutes|Made from a proprietary elastomer which has a unique cold flow and set characteristic to fill irregular gaps|Sof Shoe Shims cures angular soft foot and extends bearing and motor life|Yellow Sof Shoe shims are .045 in. thick, compress to .040 in. and absorb up to .020 of angularity