Bezels are the numbered rings on the watch. On some watches, these bezels are removable. These were used by divers to measure the length of time they've been underwater. With time, bezels can sometimes fall off, or the numbers can fade. Years of use can result in notches on the bezel, so sometimes it is useful to replace them. A new bezel is a great way to make your watch look brand new again. WE ONLY SELL GENERIC ROLEX BEZELS - we are not affiliated with Rolex. Most bezels can be snapped off with a knife or a bezel remover. The new bezel can usually be snapped on.