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The official word from Shimano PRO:
PRO Vibe Superlight Stem Alloy 1 1/4' Black 31.8mm 6°
The PRO Vibe Superlight stem is designed for sports-oriented riders and provides as PRO's lightest road bike stem for optimum comfort on the bike. The stem made of 7075 aluminum with titanium hex bolts is specially designed for optimal lightweight strength. Available in lengths from 70 to 130 mm, the stem is not only lightweight and powerful, but also allows a perfect bike fit. The Vibe Superlight stem is optimized for SHIMANO Di2 integration, compatible with fully integrated routing on models with compatible steerer, has a handlebar clamp diameter of 31.8 mm, is for 1-1/4" steerer diameter, and has an angle of ± 6 degrees. The PRO Vibe computer mount (PRAC0248) can be screwed to the clamping plate and the PRO headset cap Expander Carbon completes the PRO Vibe Superlight cockpit. Additional accessories are not included with this listing.