Sometimes keys are just the preferred way to lock up your favorite commuter bike. Kryptonite produces the KryptoFlex 1018 with a braided 10mm steel cable for cut resistance. The cable's vynil cover keeps bike frames from being scratched while providing weatherproofing in wet conditions. The key aperture has a sliding weather guard to prevent moisture intrusion as well as provide pick resistance. Duplicate keys are available through Kryptonite's Key Safe Program. The KryptoFlex 1018 Key Cable weights less than 1 pound.