I think I have as many rulers as fabric. LOL. If I'm cutting 4 inch strips, I want a 4 inch wide ruler not a 6 1/2" wide ruler. I know I could use the 6 1/2" ruler to cut the 4" strips but I don't want to. I have one ruler that only has 7/8" markings. Great for hsts. Most of my rulers are Creative Grids. The company keeps up with quilt trends and provides the specialty rulers that save time.