I have been reading a story set in the future called Space Nuts Light Speed by Simon Cooke. Just like in this story, I have written a historical file about an object we use on earth, that someone could read about in the future.
This is a pencil. People use to use these to write with on a piece of paper. When using a pencil, you hold between your fingers and place the carbon bit on the paper. You can do many things with this like wiggle it between your fingers, draw pictures and write stories. As you can see there is a rubber. The rubber rubs out mistakes and can make your work as good as new as long as you don't press the carbon to hard.