Manufactured from the highest quality materials to ensure a crisp clean wipe. The Tridon twin metal rail is based on O.E. design refills used by leading vehicle manufacturers throughout the world. Using high quality natural rubber the metal rail refill provides smooth, low noise wiping performance ensuring extended rubber life. Available in 3 backing widths: 6.5mm Narrow Back, 7.5mm Mid Back, 8.5mm Wide Back, each style has scored metal rails at marked increments allowing for easy of installation to the required length. The metal rail wiper refill must be compatible with the vehicle wiper blade; the Tridon wiper range has been carefully researched and engineered to suit each specific application.