Renthal Duo Stem: 40mm +10 degree 31.8mm 1-1/8", Black/GoldThis stem is horizontally divided, which allows it to be machined in two pieces and gives unrestricted access to the stem core, enabling weight to be reduced to the absolute minimum, without compromising strength. Made in Cheshire, UK CNC machined from 6082 T6 a solid billet of aluminum alloy Horizontally divided stem design allows for maximum weight reduction U shape cradle clamp eliminates handlebar stress risers found with traditional stems