OasisSpace is the only company that makes a walker with four pneumatic tires and costs only about $200. This walker has changed my life as an active person who has great difficulty walking. I can use this walker walking over grass or even sand in addition to rough pavement. And of course that works great in stores and in the house and everywhere else you can think of. I have two of them and they have held up well over the years even taking them on airplanes and checking them at the gate. I finally needed a replacement part after a couple years and they sold it to me at a very reasonable price. I tell lots of people about this walker especially when I'm out shopping and they stop me and asked me about it.