This urethane keystone features a recessed panel enriched with fine moulding details that emphasize its tapered form. The keystone is made to accommodate the profile of 9" and 10" crossheads with bottom trim details. The keystone attaches easily for a quick enhancement that adds character to the crosshead. The recessed keystone is precision molded in rigid-high-density polyurethane foam. Like our urethane crossheads, urethane keystones are non-porous and resistant to the effects of moisture. As with many architectural elements, the functional keystone gained prominence for its decorative value. Today, the decorative keystone brings with it a sense of prominence, detail and traditional style.