My very favorite ruler is 2 1/2 by 9 inches. I've used it so much that I've worn the corners off. I'd like to replace it with one the same length or longer but have not found any in our local stores. I found a specialty ruler for log cabin blocks that was 2 1/2 in. wide, but it didn't have all the right markings on it. Thus, it doesn't work for everything. My next used rulers are: 1 1/2" x 18", 4 1/2" square, 6 1/2" square and 8 1/2" square. I have several other rulers that I use occasionally.