I have never seen these rulers before either, but, personally I think they are a bit too pricey.......I think if one measures, cuts carefully most of the added rulers/templates we all have could be discarded and the use of one good ruler for almost every cut is all we need. I have a "collection" of rulers/templates that I really thought I "needed" and come to find out...not necessarily so......JMHO But maybe for some people these would be the answer......