K-Force SB25 Di2 Seatpost
K-Force SB25 Di2 Seatpost, The K-Force Light SB25 posts 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. Theres also the option of mounting a Shimano Di2 battery in the bottom of the post.