The Zero2 is a 3D forged stem made of 6061 aluminum alloy featuring a 2-piece faceplate. It offers a great balance between high-end engineering and an appealing design making it a the perfect component for high performance road bikes. Bar Clamp: 4 bolt | removable Included in delivery: 1x stem Material: stem: aluminum 6061 bolts: CrMo Weight supplement: at 110mm length | manufacturer information