... .2/31.6mm 4. Feature: with marks on the seatpost CNC Head Titanium SeatPost for Bicycle with Marks Material:3Al/2.5V titaniumDiameter ... .6mmLength:350mm, 380mm, 400mm and customWeight: About 180gFeature: CNC Head and with marksWe also supply other titanium bicycle parts, such as frame ... more information, please contact us. Titanium SeatPost for Bicycle CNC Head with Measurement Marks