【Premium Material】: This bike belt drive plate is made of safe and sturdy PP material, with high stability, strength, and reliable performance 【Easy to Replace】: The exercise bike tension belt disc is easy to install and use 【Replacement Accessories】: This bike belt wheel disc is made of quality PP material and can withstand high intensity training. It is a necessary accessory for indoor cycling enthusiasts 【Smooth and Efficient】: The fitness bike part adopts a belt drive design to ensure smooth and efficient operation during exercise 【Function】: Fitness stationary bike belt drive disc is great for enhancing your indoor cycling or fitness experience Specification: Material: PP Size Chart: Outer Diameter: 18cm / 7.09 inch Hexagonal Shaft Available: 1.7cm / 0.67 inch, 2cm / 0.79 inch Package Includes: 1 x Exercise Bike Drive Belt Disc Note: Please allow slight errors due to manual measurement and different monitors.