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The Zipp SL Speed Carbon Seatpost takes off where the standard Zipp Service Course leaves off. Instead of using lightweight aluminum, the Zipp SL Speed Carbon uses carbon fiber to save more weight but still retain stiffness. To save more weight, Zipp uses titanium bolts and is included with black, red and white nut retainers. Offset is 20mm and the length offered is 330mm. Adjustability is also enhanced by the use of a low profile clamp that allows the saddle to slide farther back along the rails.