Locking mechanism: REELOQ: The cable pull only locks when the rope is fully extended. To retract the rope, you also have to pull it once. REELOQ PRO: The cable pull locks at any position you like. To retract the rope, you also have to pull it once. Weight & Size: REELOQ: The REELOQ weighs 137g and has a diameter of 55mm. REELOQ PRO: The REELOQ PRO weighs 110g and has a diameter of 47mm. Rope length: REELOQ: The rope is 63 cm long. REELOQ PRO: The rope is 85 cm long.