Unbreakable Pull Cord Our diamondcord is the world's strongest and most durable pull start cord. Our unbreakable starter cord uses patented technology that is five times stronger than steel. The high-performance design allows smoother pulling for lawn mower pull cords and any other recoil starter rope applications. Using diamondcord eliminates downtime and inconvenience from broken pull start cords. There is also no monetary loss from frequent cord replacements. Applications include items like outboard motors, ATVs, plate compactors cords, and other recoil rope started devices for a 4.5 mm cord. Our diamondcord can replace nylon/polyester cord and steel cable. It is also ideal for use as an emergency tow-rope for small recreational vehicles, tie-up rope, light-gauge winch line, and other general rope use applications.