Bellofram's 0.7 inch and 1.5-inch equivalent bore diaphragm air cylinders combine the performance of the diaphragm cylinder with small size. Two different stroke options are available in each size, with either flush or extended rods on 0.7-inch cylinders. Only spring-return varieties are available.

0.7-inch Cylinders have aluminum alloy shells and end caps, and carbon steel rods. 1.5-inch Cylinders have die-cast aluminum shells and end caps, and chrome-plated carbon steel rods. All varieties have oil-impregnated bronze bearings, polyester fabric reinforced Nitrile diaphragms, and music wire springs.