O'lipfa Quilting Rulers - Optima Quilting RulersO'Lipfa rulers are excellent for a variety of measuring tasks - sewing, quilting, carpentry, wallpapering and more! Made of clear, non-slip acrylic, O'Lipfa rulers do not obscure your project or cover up previous marks. Confidently measure with total accuracy. The Optima clear acrylic rulers are non-slip, ensuring an accurate marking tool. Accurate cutting enables you to create professional looking perfectly matched corners and edges. The rulers and tools allow you to make precise measurements, assuring uniformity in your quilt pieces, including small and intricate pieces such as stars and triangles.