I've used these all my life. Early on I was very artistic, I drew constantly...on everything. All my school books were full of my doodles...if you are artistically inclined, you will understand, doodling is a force and compulsory...you can't avoid it. Thankfully my mom always made sure to spend some time with me near the end of the year going through all my school books with a few big pink pearl erasers. I would go though one a year in addition to pencil erasers and add on topper pencil erasers at school.