This series of eraser art products are called "Hankeshi Sensei". This translates to "Teacher of eraser stamp carving", and has been designed by Tomoko Tsukui and manufactured in collaboration with Hinodewashi Co. Ltd.
There are eight kinds of designs printed onto the surface of the eraser to guide you in carving them by yourself.
The links below show how to carve each of the designs into the eraser stamp.