I paid for this eraser with my own cash money at my local Artists and Craftsman. I had written the bulk of this positive review before speaking with Peter of Sakura of America who supplied facts and history about this eraser and the company. Knowing more about a company and how a product is made, is always helpful. Though I had already decided I loved this eraser before speaking with Peter, I appreciate that he spent a good half hour educating me about the science and tech behind the eraser itself as well as the aesthetic of the Sumo Grip line of items.