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Wrapped in carbon fiber and lighter that prior generations of carbon stems.

The carbon fiber wrap on the OS-99 CSI is structural.

The CSI acronym stands for Carbon Structural Integration.
It is designed to stiffen up a really light stem (it adds 20g in weight in comparison to the standard OS-99).
A stiffer stem is a more durable stem.
The OS-99 starts strong and this gives it more..

CSI is a technology is used in the aerospace industry.

FEATURES:
• The FSA OS-99 CSI Stem is a forged and CNC'd aluminum stem wrapped in carbon for extra stiffness.
• The aluminum base is AL7050.
• A gloss carbon is wrapped on top of the aluminum.
• There is a four-bolt sculpted face clamp.
• The clamp is anodized black.
• The four faceplate bolts and two steerer pinch bolts are made from titanium.
• The stack height of the stem is 41mm. The stem angle is plus or minus (+/-) 6 degrees aka 84/96-deg