Premium Material: This bike belt drive plate is made of safe and sturdy PP material, with high stability and strength, and reliable performance Easy to Replace: The exercise bike tension belt disc is easy to install and use Replacement Accessories: This dynamic 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 / 7.09inch Hexagonal Shaft Available: 1.7cm / 0.67inch, 2cm / 0.79inch Package Includes: 1 x Exercise Bike Drive Belt Disc Note: Please allow slight variations due to manual measurement and different monitor displays.