The Prym Chalk Wheel Mouse is ideal for marking on all fabrics. The ergonomic design makes it is very comfortable to hold. The fine gear at the top of the mouse shaped chalk wheel leaves a clearly visible fine chalk line, which can be removed easily by brushing or washing after the sewing. The level of chalk in the cartridge can be monitered through a small window. Replacement chalk cartridges are available with white or yellow chalk powder from other retailers, we do not currently stock them.
 
Product code: 610 950. 
 
Follow the link bellow for Pryms Chalk Wheel Mouse demo video - 
https://youtu.be/WvVt4mFaZjc