I took a class for this runner. I used a ten degree and sewed a wider seam, worked great. I added cut extra wedges to make up the wedges needed for the nine degree. The cutting and organizing was the most important part of making this. And color choices. I used shades of batik med to light browns, a neutral pack of strips I had. It looked like a snail when it was sewn together. LOL I never used it, don't even remember what happened to it now. Really bright bold colors look best for this pattern was the opinion in the class when all were made.