The document describes ControlAir's rolling diaphragm air cylinders, which provide low-friction pneumatic pressure conversion with features like no lubrication required and low hysteresis. It details the design and benefits of the rolling diaphragm and introduces the ultra cylinder with linear ball bearings for enhanced performance. Additionally, it outlines various cylinder models, modifications, applications, and ordering information, emphasizing their suitability for tasks such as valve actuation and tension control.