Zipp Seatpost SL Speed SL 31.6 330 No offset Designed with an eye on fit, security, light weight, and an extended range of adjustment to optimize fit and efficiency on the bike Based on the popular design of Zipp's Service Course seatposts, but with the light weight and stiffness advantages of carbon fiber The choice of Tom Boonen and other top pros of the Omega Pharma--Quick-Step Cycling Team; ridden by Tom during his historic wins at the 2012 Tour of Flanders and Paris-Roubaix Low-profile clamping hardware allows fine tuning of the saddle angle even after it's mounted Two nut-retainer caps are included, one red and one white