Low friction design restores steering and suspension systems back to their original operating performance. Glass fiber reinforced polymer bearing. Polyoxymethylene (POM). Facilitates low friction, less heat, and longer wear. Sealed-For-Life Boots. (Fixed/Maintenance Free). Super high strength, hardness and rigidity to - 40 degrees. Every TRW part has four levels of testing/technical/audit review before approval is given. Endurance testing 500K cycles. Rotational & articulation torque, push pull.