How to make Keshihan (Handmade Eraser Seal)

Recently, in Japan, I see a lot of people who sell or buy the handmade products online. Also, there are many online stores which just deal with the handmade products. It is very nice. Your talent and skill will earn money! What is Keshihan? Keshihan is a kind of the coined word. We call the eraser "Keshigomu" and...