Cablz Flyz Retainer. They are equipped with patented ball bearing technology just like all Cablz. They come in 22" length but can be shortened to a desired length. Specifications for Cablz Flyz Retainer: Manufacturer: Cablz Quantity: 1 Package Contents: Cablz Flyz Retainer The Cablz Flyz Retainer is a quality addition to the Cablz lineup. For more great deals on Glasses Accessories by Cablz please browse our Cablz Glasses Accessories page.