You have to make sure if your purchase at Staples or Office Depot,....or anywhere, I guess.....there is a Frixion pen that IS NOT THE DISAPPEARING PEN. It has to be the erasable pen....I use the ballpoint and purchase them at Office Depot during the year, and at CVS and Walgreens when they are having Back to School sales. I was able to get them one year for 96 cents because they had a rebate in addition to a markdown on the pens. Love them!