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: 2-1/2x2-1/2in; 4-1/2x4-1/2in and 6-1/2x6-1/2in. Made in USA.