The sank magic book is a practice copy book which is reusable,  that comes in a set of 4 books I e. Numbers, Alphabet, Drawings and mathematics. It has special pens which comes with 8pen refills, it's ink erase to be re used again. The sank magic book are perfect for children from 3years and above. They assist or help the preschool kids to learn how to write numbers, draw as well colors. They they can repeat and exercise as many times as possible since the book erase itself to be reused again