3K Carbon fiber surface and aluminum alloy body combination, make the strength of the handlebar stem handle better, the appearance is more beautiful and stylish. Stem Description: Brand:BUCKLOS Material: Aluminum alloy and 3K Carbon fiber surface Color: Black Length: 6° 60/70/80/90/100/110/120mm 17° 70/80/90/100/110mm Handlebar Clamp Diameter: 31.8mm Steerer Tube Diameter: 28.6mm(1-1/8 in) Weight: 125-150g approx Item include: 1pc * stem.