Bar-end plugs fall out sometimes. Maybe you hit a big bump, you hit it with your hand, or your bike was rolling around in the back of your vehicle. Regardless of why your plug fell out, you can easily replace it with a new one. The ENVE Road Bar End Plugs are designed for ENVE cycling handlebars. It is compatible with the standard, compact, SES Aero, and gravel bars. These are not compatible with M-Series handlebars.