The Zipp Service Course SL 80 Handlebar is an aluminium handlebar which is a bike fitter’s go-to bar for its all-round excellence. The bars 80mm reach (the horizontal distance from the bar’s stem clamp area to center of the brake perch) & it’s 125mm drop (vertical distance from bar’s stem clamp area to bottom of drops) it helps put the rider low & in control without compromising comfort. Please note: Zipp handlebar widths are measured from the centre to centre at the 'brake perch' part of the bar, NOT at the 'bar end' part of the bar.