The Elite Set Back Thomson Seatpost has a post and cradle which are machined from one piece of 7000 aluminum.Post and cradle are machined from one piece of 7000 aluminum41mm seat rail grip length16mm (5/8") set backItem SpecificationsColorSilverWeight265gLength410mmMaterialAluminumSeatpost Diameter30.9mmOffset16mmMinimum Height100mmMax Height310mmSeatpost TypeRigidClamp StyleStd RailsDefined ColorSilver