*FSA OS99 Carbon Stem Black 100mm +/- 6 Swim-Wetsuits-Men Micro-perforations all over back

Micro-perforations all over back

boosts blood flow and prevents the fabric from twisting or folding: no more hot spots or irritation on longer rides

- Rubber toe and heel tabs for walking traction and durability

Sized to fit most smartphones with low profile cases

• Elastic waist with adjustable drawcord

*FSA OS99 Carbon Stem Black 100mm +/- 6 Swim-Wetsuits-Men Micro-perforations all over backThe K Force OS 99 CSI stem is 3 D forged and CNC machined from AL2014. Then its combined with a carbon structure using our CSI (Carbon Structural Integration) technology. CSI is a process that permanently bonds carbon to alloy to create a true hybrid product, with many of the benefits of aluminum and carbon. The final details reduce the OS 99 stems weight by using a 4 bolt sculpted AL2014 alloy carbon faceplate and titanium hardware.