These racing timing belts for the Porsche® 944 are 3 times stronger than regular timing belts. They incorporate a HNBR elastomer composite tooth configuration that doubles tooth strength. Kevlar is then incorporated into the tensile cord that virtually eliminates belt stretch along with a high tech nylon fiber jacket to increase belt durability. If this is not enough, the advanced belt materials come together to give you a much higher resistance to engine oil saturation and heat than that of ordinary timing belts. When it is time to change the timing belt on your 944 only accept the best!