ProTaper 2831D Fuzion Black Dual Function Handlebar (YZ High 2831D) "Unlocked" function allows the cross bar to telescope and flex like a Contour or EVO Pro Taper handlebar "Locked" function connects the crossbar creating solid, definite feedback to the rider Made from 5mm, proprietary, 2000 series T6 aluminum alloy for superior tensile and yield strength Cross bar made from cold forged aluminum Cross bar clamps CNC machined from 6061 aluminum and adhered with aerospace quality polymer