Pneumatic cylinder represents a large family of pneumatic products. Pneumatic cylinder is also called pneumatic actuator or air cylinder. Pneumatic actuator is mainly categorized as linear actuator or rotary actuator. Gripper is also an actuator. In normal pneumatic cylinder the piston rod moves in and out to effect movement of any weight or object. In case of rotary actuator the rotation is caused due to rack and pinion or vane function. However, another type of air cylinder which is known as the rodless cylinder has no piston rod. These rodless cylinders could be either mechanically coupled or magnetically coupled.