Milled of full Al-CNC (alu parts), comes with 1 throttle handle, 4 different diameter wheels, two half-circle shells and a couple of specific wires. Four wheels is maybe the most particular feature, in fact helps to find the best gas adjustments: Silver > Blue > Red > Black , respectively from "as original" to "only race". Silver one is similar to the OEM, the middles (Blue and Red) are specific for street sport riding, while the biggest (Black) one has to be used only on track. Wires are made to resist in every condition, even the hardest ones, last a lifetime. They are specific only for Robby Moto throttle and tested on the bikes reported in the product's name. Handlebar diameter supported: 22mm.