Good Measure- 12 Wedge Circle Ruler 30ºGood Measure 12 Wedge Circle Ruler 30 30 Degree 12 Wedge Circle Ruler makes quick work of cutting dresden plates and wagon wheels. Seam allowances are marked with a solid white line, a vertical solid black line marks the middle of the wedge while the black and white dotted lines indicate 0. 5" and 1" increments, those features paired with the non slip grip ensures precise cuts every time **Actual product fabric color may vary from the images shown.