I unfortunately do not have an eraser with my pen. This is the pen I am using (https://www.amazon.com/Samsung-EJ-PT820BBEGUJ-Galaxy-Stylus-Black/dp/B06WD1GVM3/ref=sr_1_5?dchild=1&keywords=samsung+tab+s3+pen&qid=1599489863&sr=8-5), and also the tiny toothpick S Pen that came with the laptop which is similar to the ones that come with the Galaxy Note phones.
There are pens with erasers that will work with this laptop (e.g. the HP Zbook x2 Pen), but I don’t own any. Sorry!