This reel keeps optical fibers safe. The 250µm buffer protects each strand. It prevents kinks exceeding the 30mm minimum bend radius. The hub design prevents. Fibre optic cable reels with different barrel diameters and winding widths. The barrel is coated with PE foam Do you have any questions? We would be pleased to assist you. Any type of damage minimizes or even makes the installation obsolete. What is more, Fiber Optic Cable. OCC's Modular Advanced Reel System (MARS ®), the industry's first lightweight cable deployment reel system, is designed specifically for the demanding needs of harsh-environment fiber optic installations.