ADJUSTABLE non-conductive monofilament like cable (available different colors but only in 14" length)The Adjustable Cblz Monoz are designed to be worn extended at regular length or "zipped" for a custom fit to the back of the head!Cblz Zipz are designed to be worn extended at regular length or adjusted for a closer fit to the back of the head.Features:Adjustable, Monofilament-Like Cable14" Adjustable Cable LengthAvailable in Universal Silicone end accommodating most temples sizesBlack Monoz is offered in 3 Silicone end sizes: Universal end, XL end, Skinnyz (XS) endAvailable in 7 color options14" Size Extends to 14" and Shortens to approximately 9a ^2Durable, Lightweight, Low Profile, WaterproofNon-ConductiveTip: Use an alcohol-based hand sanitizer to apply Cablz to your eyewear for easy application and secure fit.