Special cylinders are cylinders with a shape or application that is different from a regular cylinder. For example, the ultra-compact cartridge cylinder is threaded on the outer diameter to facilitate mounting onto a jig or panel; the low friction cylinder can be operated across a wide range of drive conditions, such as pressure or speed; and the precision cylinder is equipped with an internal guide function. The applications and locations of use of special cylinders vary according to type. In many cases, these cylinders are introduced in order to improve efficiency, such as saving space or improving maintainability, reducing work times or making production line operations smoother. To enable a flexible response to highly specialized requirements, special cylinders are also available whose specifications can be specified in detail, such as the type and quantity of screws and switches, and whether additional functions are equipped.