Use with rotary cutter or straight edge blades. Made with a unique numbering and angle system, and may be used with either right or left hands. Grid in both Neon Green and Black so that it will be visible on both dark and light colored fabrics. 6″x 12″- 1/8″ markings for precision measuring and cutting. Great for short strips, shapes and 30, 45, and 60 angle markings Made in USA