Mine is 2 1/2", but I do not remember the size they mentioned in the tutorial. Since these blocks are made of mostly 2 1/2" strips, I thought I would stick with that size. I made a 9 patch for my son in December, and that was the first I had ever tried 1 1/2" strips as sashing. It looks great with that quilt, but not much room to try out very many patterns/motifs. But I am still a baby quilter, LOL!