This item is a treadmill security key, adoption of good plastic, alloy and rope material. This safety key can stop the running machine quickly, and it is a good helper for ensuring your safety while using your treadmill. Easy to use and operate, it is suitable for gym and home use. Features -Color:Black -Material:Plastic, alloy and rope -Size (red part):3.20X3.20X2.50cm/1.26X1.26X0.98in -Size (black part):4.30X2.80X0.50cm/1.69X1.10X0.20in -Adoption of practical plastic, alloy and rope material, sturdy and durable for long-term use. -Easy to use and simple to operate. Just place the safety lock in the panel groove, and the other end to your clothes. -With this , there is no need to worry about treadmill users being injured on the treadmill. -Suitable for adults, , the elderly, keeping safety while running on the treadmill. -Lightweight and compact size, not taking up much space, not increasing extra burden. Package list: 1 x Treadmill Lock