Dritz-omnigrip combo pack.Quilter’s rulers are plastic injection molded rulers with clean, crisp, accurate lines.The molded lines keep fabric from slipping, allowing for fast, accurate rotary cutting.There are 1/2 and 1/4 markings and has 30, 45 and 60 degree lines.Black markings.For use with rotary cutters and straight edge blades (items not included).Contains one 10-1/2×10- 1/2 inch quilter’s square ruler, one 8-1/2×8-1/2 inch quilter’s square ruler and one 6-1/2×6-1/2 inch quilter’s square ruler.Each has 1/2 inch seam allowances.Made in usa.