This 6.5" x 18" inch ruler from Creative Grids is an amazing addition to your quilting tools.
The black and white markings make the ruler easy to read. There is a 1" grid with 1/8" and 1/4" increments. Using the numerical white dots and 1/4" grip to cut complete inches. Then turn the ruler around to add the seam allowance using the 1/2" grip side and numerical black dots.
The gripper stops the ruler and fabric parting ways! I am sure we have all had a fabric cutting disaster when our ruler slipped.