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In page Writing in space:

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The wood pencil has been used for writing by the Soviet space programs from the start.[citation needed] It is simple with no moving parts, except for the sharpener. The mechanical pencil was used by NASA during Project Mercury,[2] and it remained one of the most used writing instrument up through the Gemini, Apollo, and Skylab programs.[3] It can be made to be as wide as the width of astronauts' gloves, yet maintain its light weight. There are no wooden components which might catch fire and create dust. However, the pencil lead still creates graphite dust that could conduct electricity.