Package includes 50 green replacement erasers. The Build-A-Pencil Eraser is a replacement eraser for the Pencil Shield. Maximize the use of your pencils by changing the eraser when it wears out and continue to use the same pencil until it gets worn down to 1-1/2". This concept of interchangeable parts for pencils is only made possible with the Pencil Shield. Not only is it safe, but it is also green and economical. It Saves trees and money. Made in USA. Simply Twist on for Safety, Twist off to Use! Maximizes the use and minimizes the waste!