The FSA OS-99 Carbon Stem falls under FSA’s top end K-Force series. This series features the latest advancement in carbon composite and metal alloy technology coupled with state of the art manufacturing processes. K-Force components will always showcase the embodiment of what FSA’s dedication to advancements in the art of product development. The OS-99 stem uses both alloy and carbon technologies, as it 3D forged and CNC machined from AL2014 a lightweight but strong aluminium alloy. Then FSA apply UD carbon weave skin using a CSI process to give the stem and great finish. The 4 titanium bolts secure the sculpted AL2014 alloy/carbon faceplate making it a great looking stem.