Perfect Piecing Seam Guide by Perkins Dry Goods. I think mine fell in the trash can. I tore my sewing room apart last night, opened all my machine cases and the attachment cases. Looked in all my drawers - no luck. It is gone. I ordered another one, so I know the sewing gremlins will return it the day the new one arrives. It kind of ticks me off that I was so careless; the guide is only 4 inches long, but with shipping, is close to 7.00 to replace.