Extremely light and durable unidirectional carbon fiber tube, paired with a cold forged 2014 head and clamp. While only compatible to our patented I-Beam Technology saddles – the original “mono rail” is the premier seat to post connection system, which utilizes the latest composite materials to create an extremely light yet unbelievably strong saddle and post combo. The I-Beam post features a single side bolt clamp design, which allows for simple installs and micro adjustments, while offering the widest range of fore/aft and precise tilt adjustments in the industry.