Fiskars 12-39817097J Donna Dewberry Acrylic Ruler, 3.5 by 18.5-Inch Highlighted seam allowance makes it easy to cut fabric strips up to 3.5 wide Broken grid lines and easy-to-read measurements make measuring quick and accurate Triangle and star patterns simplify shape cutting Optional non-slip vinyl feet can be added or removed without damaging the ruler Lifetime warranty