I think (but am not positive) that TriRecs is sort of a copyrighted name by Diane Zimmerman and Joy Hoffman. It originally was only manufactured by EZ Quilting. The newer ones have the Wrights brand, but if you look on the rulers they still have the EZ Quilting logo, so maybe Wrights now owns EZ. Dunno. Anyway, there's a single manufacturer. I would get one of the newer Wrights packaged ones as they now have the additional trimmed corner on the narrow triangle for easier placement. This is demoed in the Fons & Porter instructional videos.