1Built to Last: This treadmill universal safety key is made of ABS plastic and magnet, which is lightweight, strong and not easy to damage, and is suitable for long term use by runners. 2Strong Clip: Treadmill safety key can be easily clipped to any part of the clothes, and it is very firm. It can be easily clipped to almost all types of clothes. Simple and convenient to use. 3Treadmill Magnet Safety Key: Magnetic work, can work easy and quick on most treadmills requiring a round treadmill safety key. Protect you in safe when treadmill gets some problem, great replacement key for treadmill. 4Safe: This lock is an automatic guard device for the treadmill. When the safety switch exceeds the sensing area of the treadmill, the running machine immediately stops working and emits a prompt tone to protect the user from falling and injuring during exercise. 5Easy To Install: The treadmill safety key can run perfectly on most treadmills, small, lightweight and easy to install. Safety key is extremely important to maintain the efficient working of any treadmill. Item Type: Treadmill Safety Key Material: ABS, Magnet Product Size: Approx. 40x29mm / 1.6x1.1in 2 x Treadmill Safety Key