Croakies Terra Spec Adjustable Eyewear Retainer, Black : Amazon.ca Croakies Terra Spec Cord Eyewear Retainer Navy Adjustable New Authentic Croakies Terra Spec Cord Eyewear Retainer Black Adjustable Long New Croakies Terra Spec Retainer Review The Civil War Croakies Black Terra System Adjustable Eye Retainer, Medium, Nylon. Thanks to the universal compatibility of our Spec ends, Terra Spec Cords fit the widest range of eyewear styles. Made with a high quality durable woven cord and featuring an adjustable slider bead for a secure fit when chasing your next adventure. Features Available in Spec Ends Durable woven cord Adjustable black bead Colorfast & washable Sizing O S (One Size) universally compatible, fits a wide range of temple sizes 12 long (each side) by 3. 2mm (diam.)