Its the Perfect Bungee for a reason. Unlike conventional shock cords, Just Ducky Products uses solid polyurethane to form their bungee cords. The solid material stretches twice its length and will resists cracking and the harmful effects of fuels, UV, saltwater and household cleaning products. These shock cords will maintain elasticity even in extreme temperature swings. Corrosion-free glass reinforced nylon is used for the hooks for strength and to prevent damage to gelcoat and painted finishes. Key Features Unique long lasting shock cord Solid polyurethane shock cord that will stretch twice its length Resists cracking and damaged caused by exposure to fuels, household cleaners, UV rays and saltwater Corrosion-free glass fiber reinforced hooks that will not scratch paint or gelcoat Sold individually