These are just alright. They leave a little bit and I can still read what I
wrote without looking too hard, as compared to a Uni Boxy, which erases
completely without nearly as much pressure. I use the Blackwing Pearls in a
Baron Fig notebook most of the time. These are good if you don't mind it not
erasing 100%, but I would just cut up a Boxy into the right shape and replace
the stock eraser. Little bit of work, but worth it.
The Blackwing pencil last a good amount of time so the erasure may go a bit
early. The replacement erasers here are easy to switch out and a good quality
eraser. I recommend them if you use the Blackwing pencil.