This 48 inch Swanson straight edge is made of high-grade aluminum alloy that features a yellow powder paint finish which has been thermally bonded to the straight edge for easy measurements and lasting accuracy. 48 inches is our most popular straight edge which is both lightweight and strong so you can use for a variety of tasks and projects - from construction to quilting. The black gradations pop against the bright yellow finish which adds a measure of personal safety when using this straight edge as a cutting guide.