Amanda Murphy's Wedge Circle Rulers feature a special nonslip back and clear marking in two colors. With generous surface area, you'll find then easier to hold. Their design makes them easy to read and makes fabric simple to cut! The Every Wedge Cutting Rulers set of 4 rulers makes cutting out Dresden Plates or Wagon Wheels fast and easy. Make 12-Wedge, 16-Wedge, 20-Wedge, or 24-Wedge Dresden Plates, or even combine multiple sized wedges for creative Dresdens. The possibilities are endless!