SMC's CQS clean room, compact air cylinder has 4 bore sizes. Standard strokes range from 5 to 50mm. 10/11-C(D)QS series, available for clean environment, prevents particle generation in a clean room. 21/22-C(D)QS series offers the same structure as the clean series, and are for the environment in which the use of copper, fluorine and silicon are restricted. The 
Clean Series: 10 (Relief Type), Magnet: None, Bore Size: 25mm, Stroke: 10mm, Rod End Thread: M (Male)
Clean Series: Relief Type, Magnet: None, Bore Size: 25mm, Stroke: 10mm, Rod End Thread: Male, Auto Switch: -, Lead Wire or Prewired Connector: -, Number: -