Avid db3 disc brake elixir replacementwhen youre tackling rough trails nothing affects your confidence and control more than your brakes with increased negative volume to combat heat expansion plus powerful larger caliper pistons db3 gives you the juice to up your game and a new bladder material reduces air bubbles ensuring power and consistency on every ride featuresweight405glever materialaluminiumcaliper design2 piston cast 2 piece aluminiumrotorg2 cleansweeppadorganic to