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Design Note: For our students, especially designed for students who learn, pencil is very commonly used tools. Because pencil refills are always exposed, so it is easy to break; and we often drop the pencil, because it is too short and not easy to use. To address these two issues, I designed this retractable pencil protector clip. It is the settlement because of the lack of protection caused the problem cartridge is easy to break, on the other hand, to a certain extent, increase the length of a pencil, make a pencil longer.