FSA K-Force SB0 Di2 Seatpost - The K-Force post's one-piece carbon fiber shaft and head are topped off with a forged alloy Minimal Top Clamp, giving a full range of adjustment and secure saddle mounting at a very low weight. There's also the option of mounting a Shimano Di2 battery in the bottom of the post.Forged alloy Minimal Top Clamp (MTC)One piece continuous carbon fiber constructionRemovable mounting hardware for FSA WE or Di2 batteryUD carbon finish