High pressure injection molded polypropylene - medium gray colors, butyl mastic on the top and bottom guarantees no slipping|All sizes of heat pump risers can handle a uniform load of 2000 pounds with no failure when installed under the unit in an array of at least four heat pump risers|All sizes of heat pump risers can handle a point load, applied to one square inch area in the center of the footpad recess on the top of the HPR, of less than 800 pounds with no failure

PROP65: Cancer and Reproductive Harm - For more information go to www.P65Warnings.ca.gov