Projekt Fixie seatposts come in two different sizes for any type of cycling needs. Designed for strong endurance and performance. Anodized colors are used for high quality coloring and prevents from fading. UV resistant, as well as more vibrant colors and hue. Compatible with, but not limited to road, track, fixed gear, bmx, mountain bikes. Please be cautious when inserting seatpost into seat tube: any forced entry or improper insertion can scratch the seatpost. Color options are available for your customizing needs. Built to last and very light weight.