The cover rattles. However, you can't open it with the usual methods. You have already been deceived. It takes only one move to open. But you will be surprised to know how to open it. It is based on an idea that was considered when developing an item over 10 years ago. At that time, I had to store this idea until later due to some issues. However, it was perfect for adding to this new device and makes the idea seem even more brilliant. Enjoy my “old-stored idea”. The material teak is hard to process but was used because it’s beautiful. The one-point Yosegi was made by Yoshiyuki Ninomiya.