Keeper® 24 in Ultra® bungee cords combine technological advances with innovative features, making them stand out as the ideal bungee cord for a variety of personal and commercial needs. With a steel core inside, it is stronger than conventional bungee hooks and a glass-filled nylon outer sheath adds grip and protects belongings. All Ultra® bungee cords are made from premium-grade cord with a woven outer jacket that resists damage from UV rays and weather. Keeper® bungee cords are available in a range of highly visible colors. Bulk.