If I counted all my rulers....I am sure I would have more than 50...oops....anyway....most are omnigrids...if a very wide variety of sizes....for some reason I love using the smallest ruler that will work....most of mine are the old style but I have a few of the ones with the green stuff around the lines that are supposed to make it grip better....these rulers have served me well for 30 some years and I have too much invested to switch to the newer brands out there....keeping to one brand help's I think...One thing I do enjoy however, is that I have a couple of the larger cutting mats that are different colors.....sometimes if a color blends in with the mat you are cutting on...it really helps to another colored one to switch to....