Simplicity Studio Simpli-Ez Piping Wizard
I bought this tool at Tuesday Morning Store for $8. I guess it's purpose is to make perfect seam allowance of 1/4" or 1/2" with 1/8", 1/16" 1/4" or 1/2" piping. Not much about it online that I can find. TM store here has the 6 ft long cutting mats for $30.