Striated Wall Comb---as the package says, "Great tool for striped Faux Effects. Includes Bonus Comb". It has a rubber squeegee-like edge (two widths) for creating effects in fresh wall paint. Package has never been opened, so all instructions are on the back.
I'm just too old for this project now! Easy porch pickup in NW Oak Brook, south of Yorktown mall. I'll work with you on pickup date/time if you want to avoid tomorrow's snow.