- Double Enders made from 316 stainless steel for Stage Strap, Lift Bag, Scooter Leash. - This grade of stainless steel has a high amount of chromium and nickel as well as molybdenum which results in a high degree of corrosion resistance. Importantly, the springs are also made from stainless steel so they will not rust through and render your double-ender useless. - Each bolt snaps and double-enders are hand-tested as well for ease of use to meet Halcyon's quality standards.