I just looked at the one I was using until yesterday when I finished the bed size quilt I was working on. It probably is a round 36" Hintenberg. It has a single post with three legs and is adjustable up and down and in all directions. I have quilted at least a dozen or more bed size quilts with it. I have another smaller one that has square corners on a round frame. Both are wooden. For small portable projects I use the plastic snaps frames you can get at Joanns. I sometimes combine sides of two different sizes to make the shape I need. I don't remember what I paid for the wooden frames but the money was well spent.