Typewriter Erasing Shield
on the front it says...
"NE-TO ERASING SHIELD
AND WORD MEASURING RULE
FOR ERASING PLACE NE-TO UNDER WORD TO BE ERASED AND ON TOP OF CARBON PAPER - NEVER UNDER CARBON PAPER.
COMPLIMENTS
MINERAL WAX TWINS
CLEAN & GOOD
Who Typify the likeable Qualities of Ribbons and Carbon paper.
THE COLUMBIA CARBON Co
LOS ANGELES,CAL
MAIL ORDERS SOLICITED"
The back has a small piece of green felt glued to it.
Thank you again Angelica.