Zipp SL Sprint Stem - 120mm 31.8 Clamp +/-12 1 1/8" Matte Black A3Zipp SL Sprint Stem 120mm 31. 8 Clamp + 12 1 1 8" Matte Black A3. Just as cyclists maximize performance by being as light but as powerful as possible the SL Sprint Stem strikes the ideal balance of stiffness and lightweight to deliver responsive handling without wasting a single watt. Unidirectional carbon The SL Sprint comes with its own stem cap thats designed to be aerodynamically efficient by blending into the stem body Includes stiff aluminum