Premium Material: The safety key is essential for keeping a treadmill running efficiently. This round treadmill safety key is made of high-quality ABS plastic, braided rope, strong magnets, and springs to enhance durability and security. Treadmill Safety Key: Features magnetic operation for quick and reliable performance on most treadmills requiring a round safety key. It securely clips to any clothing for easy attachment, allowing hands-free use during walking or running. Solving Common Problems: If your treadmill fails to power on or experiences inconsistent power, the issue may be a faulty safety key. This replacement safety key resolves common treadmill startup issues at a low cost. Wide Compatibility: This universal treadmill safety key is compatible with approximately 99% of treadmills and works with most major brands including Alliance, Pacemaster, Fitness Gear, Horizon, Bowflex, Landice, Lifespan, Livestrong, Merit, Pathfinder, Smooth, Sole, Sunny, Rhythm, Victory, and Xterra. Due to variations in design, fit cannot be guaranteed on all models. How to Use: Insert the safety key into the treadmill console to activate the machine. Attach the clip to clothing. If the key is pulled out during use, the treadmill will automatically stop for safety. Quantity: 1-Pack Treadmill Safety Key (treadmill not included) Size: Outer diameter 2.8 cm, inner diameter 1.8 cm, rope length 1 meter (for reference only) Color: As shown in images Note: Slight color and size variations may occur due to lighting effects and manual measurement. Please allow 1–2 cm variation.