This is the 2nd generation of the shimano i spec b mount system where the gear shift mounts to the brake levers making a nice looking and adjustable sti system the shimano xt m780 10 i spec b mount pair shifters is a dyna sys 10 speed shifter with vivid indexing which is light to the touch positive feel to the shift shimano have used their multi and 2 way release where the up shift lever moves both ways so you can use your thumb and finger to shift and make your handlebar set up unique to you