ADJUSTABLE non-conductive monofilament like cable are available in Black 14” length with XL ends The XL temple end is for your larger framed glasses (perfect for Kaenon, SPY, etc). The Adjustable Cāblz Monoz™ are designed to be worn extended at regular length or "zipped" for a custom fit to the back of the head! Tip: Use an alcohol-based hand sanitizer to apply Cablz to your eyewear for easy application and secure fit.