It has a bronze plate attached to the dizi for you to slide over the dimo hole. The purpose is to protect your dimo after you fix it on your dizi when it is not in use.
One end of the dizi that is made of bone or buffalo horn can also be detached to reveal a secret compartment where you can store your dimo and er jiao.
Clever right?
Except that the bronze cover creaks and feels like it needs oiling when you slide it. And the secret compartment feels like its going to drop off any moment, spilling all the secrets in your dizi....
