This is a very nice scale and if you make,or build things to scale for you models eventually you are going to need one of these. I was afraid it may be to flexible seeing no perforation/or rise in the length of the spine this had me wondering as to it's sturdiness. This is perfect next to zero flex for good strait calculations. On one side you have big letters 1:35 and 1:25. On the other side you have 1:48. 1:24 and 1:72 scales. It's beautiful,and so is the price. This seems as it will last a long time. Haven't used it yet but am very impressed. Recommend highly.