This treadmill safety key is characterized by convenient clip design, which makes it to easily clamp to any part of your clothing and is not easy to fall off. This treadmill safety key can be installed easily and work well on most treadmills requiring rectangle treadmill safety key because of its strong magnet. It is helpful to ensure your safety when exercising. Using high quality plastic and magnet material, this product is reliable and durable to use. The length of the product is 4.7cm, the width is 3cm. It is suitable for most treadmills that use magnet keys. Item Name: Treadmill Safety Key Material: Plastic,Magnet Features: Quick Installation, Universal, Running Safety Size Details: 4.7cm x 3cm/1.85" x 1.18" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Treadmill Safety Key (Rope Random Color)