Energy Suspension Hyper-Flex Sway Bar bushings are more durable compared to rubber. Polyurethane can withstand road grime, weather and oils unlike rubber. It offers a firm hold on the sway bar and does not bend. Its snug grip provides a performance boost, which is the same as installing a larger sway bar. Among all the products Energy Suspension offers, the Polyurethane sway bar bushings and end links offer utmost progress in performance. Increase in performance, cost-effectiveness, easy to install and increased in efficiency are a few of the reasons that make it popular. Hyper-Flex Polyurethane material are long-lasting compared to OEM rubber bushings.