thanks ladies, I just learned something new, My mat is so worn out that the inch markers are gone.. it is one of those milky clear mats from Joann's and I have had it for about 6 years and have cut out over 150 quilts on it, no more as I cut a lot out for my friends.. I really want oneof those green or blue commerical mats that I can build a table with space tp iron on the other end and have storage below.. wishful thinking but one day...