CM Designs Add-A-Quarter Plus Ruler has a specially designed 1/4 inch lip marked in 1/8 inch increments. Use your rotary cutter when foundation piecing to trim excess fabric and provide a straight line for the next fabric placement and the tapered edge can be used when folding back the foundation paper. It's fast, easy, you can cut multiple layers, and it is made of recycled plastic! 12 inch long. A portion of the proceeds will be donated to help fight breast cancer special for this special Pink ruler.