Part Number ：10217-131 Elliptical Drive Belt Compatible with Precor EFX 5.17 5.21 5.23,fits for many Precor EFX Models. High quality:It is made of high quality rubber material and has been tested by the manufacturer, so you can buy it with confidence that it will last a long time! Compatible with many Precor EFX Models 5.17 5.21 5.23 etc. Easy installation:Installation is very easy, just remove the old belt and replace the new one, the whole process only takes a few minutes, if you don't know how to install it, you can learn about the installation process on the related website, which can save your time. Premium quality: The belt is made from durable high-quality rubber, which features a high wear resistance and non-cracking design - Ensure long-lasting and effective performance.This can fulfill your daily maintenance and bring great convenience to your life, saving time and money。 Please recognize your fitness machine model before purchase, if you have any questions you can contact us! We will try our best to reply you.