Also a quick note on erasers… when using the friction pen you must use their eraser because the ink doesn’t actually leave the paper. What happens is that heat turns the ink invisible (you can also stick your notebook in the microwave and erase all the pages at once).
But with a pencil you never want to use the built in eraser because 99% of them are garbage. You want a good eraser. I like the Pentel Ain Regular eraser. Its small, rectangular shape is easy to hold and control, and its black color means that the eraser never looks dirty! Appearance aside, this eraser erases incredibly well with very little mess. The residue from the eraser sticks together in thin strips for easy cleanup. If you’re looking for an all-purpose, no fuss, no frills eraser, this is it!
For fine work nothing beats the Tombow Mono Zero Precision Eraser. Also known as an “erasil,” this plastic eraser is in the shape of a pen, so you have complete control over what you erase. Its extremely small size and its ability to erase small mistakes and details well. It allows you to precisely pinpoint even the tiniest mistake on a chart and remove it completely.
And for erasing colored pencils the best bet is a very light touch (you can cut through your charts quickly with these) with a sand eraser designed to remove color pigment.