Treadmill Safety Key: This magnetic safety key is suitable for most treadmills, which works easily and quickly.High Quality Material: The treadmill safety key is made of premium ABS material, durable, solid and lightweight.Strong Clip Design: There is also designed with clip which can easily clamp to your clothing in any parts for holding.Proper Size: Diameter of magnet shell is 3cm/1.18inch, the rope length is 100cm/39.37inch, easy storage and carrying.Great Gift: This portable treadmill safety key for long term use by runners is also a wonderful gift choice for families and friends. Specification: Material: ABS Size Chart: Diameter:3cm/1.18inch Rope Length: 100cm/39.37inch Package Includes: 1Treadmill Safety Key Note: Please allow slightly errors due to manual measurement and different monitors.