Second, the subordinate rights feel a bit redundant, which does not help the main rights. It is recommended to delete.
In addition, as far as I know, pencil lead's pencils had similar products many years ago. Is the kind of thin pencil lead that can be pressed out in a plastic pen container.
So for your design, I personally feel that it is not novel enough, and it is difficult to get a patent authorization. I suggest you think twice before you act.
I hope I can get your adoption!