I have a Martelli quilter's edition mat that I purchased at a quilt show. It has the 1" squares marked on it as well as the blocks going from 2" to 12". Being left-handed, many times I've followed directions for righty's and had to walk around the cutting table. This way I just turn the wheel and cut away. I've really loved mine. I also have a Brooklyn smaller size, but much prefer my Martelli since it is marked. They both work well for a lefty, however.