Perfect for artists, architects or anyone who needs help erasing! The Helix Professional Automatic Eraser is easy to operate with a push of a button, and the precise eraser refills make details a snap. The small eraser nub is great for removing small details and errors because the eraser spins rather than having to be rubbed back and forth. This compact and easy to use eraser operates on 2 "AA" batteries (not included). Comes with 10 eraser refills that are PVC, Latex and Phthalate free!