The new Zero1 stem is the perfect combination of stiffness, lightness and a refined aero shape. It's made from 6061 aluminium and it's manufactured using an innovative 3D forging process. The flat top section of the stem perfectly mathes the top tube of a modern road bike. Designed from the start for the most demanding riders at an unbeatable quality to price ratio. Features: Material: 3D forged alloy 6061 Angle: 82deg Handlebar Dia: 31. 7mm Weight: 145g (110mm).