http://www.aea11.k12.ia.us/print/Ellison.html
The colorful Ellison symbols are fun for students and can be used in instruction. They are available in a variety of colors and sizes and range from $.03 to $.06 each. A full-color catalog and order form are online.
Tiny (1”)
Small ( 2 ¾”)
Large (4”)
Double Cut (11”x3”)
Extra large (8”x11”)