Chums Eyewear Retainers | Slip Fit Rope | Black Slip Fit, 2pk, w/Cloth & Screwdriver Model #12121; The Slip Fit , Home grown in the USA; Length: 13.25", Usable length: 23" The Slip Fit rope retainer slides over your eyewear frames to provide a forward-mounted style. The nylon rope construction provides unique strength and durability, while adjustable bead allows you to easily find the perfect spot for your shades. Fits small to medium frames. Streamlined forward-mount ends. Fully adjustable with bead, Durable perlon cord. Bonus, Free large microfiber cloth (color may vary) and screwdriver keychain Black Slip Fit, 2 pack