Magic sank books! 
Can be written on more than 1000 times
Embossed / reusable
With the included magic pen and refills you fill out your workbook and practice letters/numbers 
After some time the font will disappear and return to its original state which can then be used repeatedly again and again. 
* supplied pen must be used 
Comes with 5 refills 
And a rubber pen support to help your child learn the correct grip for writing