[phalatina] 2-bolt tightening lightweight carbon seat post 27.2 30.8 31.6 mm Glossy Matte Road Mountain Bike MTB Cyclocross A comfortable travel companion!This is a very light full carbon (3K) seat post. Carbon looks beautiful and has a luxurious feel. Can be used with compatible mountain bikes cross bikes road bikes bicycles. The fixing force is high because it is tightened with two bolts using a hex wrench. If you use a separate seat post clamp, the fixing force will increase. Please choose the color from "Clear Black" "Matte Black" and the size from "27. 2", "30. 8", or "31. 6". Color: 27. 2 Clear