Zipp Service Course SL, Zipp strikes an admirable balance between cost, weight, and performance with the Service Course SL Alloy Stem, which features a 3D-forged 7075 aluminum construction to give it a mix of superb strength and stiffness.
 
ZIPP SERVICE COURSE SL STEM FEATURES:
Forged AL-7075
Machined and relieved faceplate
Features titanium hardware with TORX heads on all bolts for precision torque readings and ease of adjustment
Stem Angle (deg), -6
S.H.I.S. Stem Clamp Diameter, 28.6
Color, Polish Black, Beyond Black
Material, Aluminum
Bar Clamp Diameter (mm), 31.8
Stack Height, 41
Length, 90mm, 100mm, 110mm
Weight, 125g (100mm)