The 12-CY3B Rodless Cylinder - Magnetically Coupled uses industrial strength magnets located in the piston and external carriage to form a single unit that will travel when actuated with air pressure. It uses fluorine grease making it inert to temperature fluctuations, chemical exposure and various gases which will not cause cracking or swelling in synthetic rubbers or elastomers qualifying it for ISO Class 5 (Class 100) clean room rating. Please note the 12-CY3B must be used with an external guide to support the load.