Milspec Cobra Cuff XTREME Zip Ties: The Only Super Heavy Duty, Double Locking, Foldable, Zip Tie. Special formula makes them much more resistant to damage from extremes in temperature and humidity than standard disposable restraints. 250-300 lb+ Tensile Strength. Available in Black, White & Glow in the dark. Folds from 24" to less then 8".