Feature: 1. ABS and Magnet Material: This treadmill key is made of ABS plastic and a magnet. Strong magnetic working, sturdy and not easily damaged, suitable for long term use by runners. 2. Strong Clip: It can easily clamp to any part of your clothing and it's strong to hold. Easily clips to virtually all types of clothing, easy and convenient to use. 3. Circular Magnetic Switch: This magnet safety key can run perfectly on most treadmills that require a round treadmill key, compact and lightweight, easy to install. 4. Perfect Replacement: This universal treadmill safety key is suitable for most of running machines, is a perfect treadmill key replacement for you that you can enjoy your exercise. 5. Usage: This lock is an automatic protection device of the treadmill. When the safety switch is out of the sensing area of the treadmill, the treadmill will stop working immediately and give a prompt tone, so as to protect the user from falling down and getting injured during exercise. Specification: Item Type: Running Machine Safety Switch Material: ABS and magnet Weight: Approx. 43g/1.5oz Color: Red. Package List: 2 x Running Machine Safety Switches