If it's a square with in a square pattern that's on her website I think you could get away with any square ruler that's bigger than the finish square. It looks like a ruler just marks where the perfect middle of the square within a square is. You could easily Mark that would type on your own ruler. If it's that quilt pattern there's no way I'd buy a book work if it's a square with in a square pattern that's on her website I think you could get away with any square ruler that's bigger than the finish square. It looks like a ruler just marks we are the perfect middle of the square within a square is. You could easily Mark that would type on your own ruler. If it's that quilt pattern there's no way I'd buy a book or a specialized Ruler after also playing for the class