OMNIGRID-Quilt Ruler Set. These rulers were designed to give you ultimate accuracy when it comes to measuring, marking and cutting your pieces out. Rulers feature clear acrylic construction with black and yellow marking and instructions for use. This package contains three Omnigrid rulers: 2-1/2×2-1/2in, 4-1/2×4-1/2in and 6-1/2×6-1/2in. Made in USA.