Specification: the length has Xml: namespace prefix = st1 ns = "urn: schemas-microsoft-com: office: smarttags" />25mm , 30mm , 40mm , 50mm , and we also can produce as per the client's need. The section looks like BOW, the diameter is 2. 5mm -2. 8mm and the thickness between 0. 4 and 0. 8. It has a wave shape appearance.