Directional butting of the Energy SBS SB20 seat post’s 6066 aluminum shaft gives it thicker walls fore and aft for stiffness and thinner walls at the sides to cut weight. A forged and machined alloy head is bonded into the top of the shaft. 3D forged and CNC machined AL6066 w/ alloy headDirectionally butted tube (thicker wall fore and aftFit Ø7mm standard rails and 7X9mm oval railsFinish: black anodized finish gray logoTypeSeatpostsTechnologySBS, NoColorNeutralSeriesENERGYDisciplineROADMaterialAlloyWeight (gr)278CompatibilityWE/Di2Length350Seatback Interval20