Feature:1. Function: Magnet safety key protects users from falling down in the process of sports injury, is an automatic protection device for the treadmill.2. High Quality Material: Safety keys are made of high quality ABS and magnet material, wear resistant, high strength, sturdy and durable.3. Wide Application: Universal safety key with magnetic suction, can work on most treadmills, have a long service time, more practical.4. Easy Operation: Treadmill safety key easily clips to clothes, keep you safe during sports, easy to operate and install, save your time and energy.5. Portable: Running machine safety key is lightweight, the compact size is convenient to carry, with approx. 92cm/26.22in length rope.Specification:Item Type: Treadmill Safety KeyMaterial: ABS and magnetSize: Rope length approx. 92cm/26.22in, magnet shell diameter approx. 27mm/1.06in, magnet diameter approx. 15mm/0.59inCharacteristics: Treadmill safety lock, automatic protection, magnetic suction, safe, compact, easy to use, easy to install, sports equipment..Package List:2 xTreadmill Safety KeyNote:Rope micro elastic, manual measurement error allowed, does not affect the use.