Pick one up and you'll see and feel the difference compared to wood or other composite beams. PUPI® Tangent Crossarms weigh significantly less than wood beams-with up to six times the strength. A closed-cell polyurethane foam fill provides lightweight, field drillable, strength and stability-that also prevents moisture and contamination. From impact-resistant endcaps to patented internal bushings, PUPI® Tangent Crossarms are built to last.