The FSA K-Force Light OS-99 Carbon stem features a 3K carbon wrap around a 3D net-forged 2014 alloy core. The common carbon wrap approach increases stiffness and dampens road vibration. This creates a stiff, but comfortable component that enhances ride quality.

Like other high-end FSA products, the OS-99 stem had a nice build quality and finish. The subdued black graphics blend into any bike color scheme and match any handlebar. The sculpted face plate is simply beautiful and shaves grams, but not durability. The two steerer bolts and four fixing bolts are all constructed from 6/4 titanium.