It can offer more of producing efficiency for customers, and also owns the certificate of patent in many countries around the world. It will not be influenced by partial bladders failed to cause the running machine stop and material damage. The air shafts we designed can normally operate even though partial bladders failed. Row material does not waste, and it reduces defective proportion. Depending on customer requirements, we can make it more of concentricity, truth round, and truth straight. It is especially suitable for the production of expensive material.