This Non-Slip Strip Ruler is designed to make cutting 2½" wide Jelly Roll Strips quick and easy. The ruler is 15¼" long by 5" wide , the ruler side is 2½"wide so that you can cut 2½" wide strips as well as Trapezoid. Then Turn-a-Round™ the ruler and line up all the trapezoid along your strip of fabric and cut multiple trapezoid all at once. Put two strips of fabric together and cut 6 pairs of trapezoid at the same time. The unique NON-SLIP grip keeps the ruler in place to ensure accuracy. The holes cut out of the ruler enable the rotary cutter to cut past the strip without damaging the ruler.