Shimano Acera SL-M310 Rapid Fire Shifter,left 3 Speed ; Right 8 Speed Left 3 speed, Right 8 speed, Rear shifter for 8-speed (rear) cassette setup Indexed speed indicator, Configuration: Trigger, Color: Black Easy to read optical displays, RapidFire dedicated up and down shift levers Compatible with most mountain/hybrid bikes with flat handle bars NOTE: this is just shift lever, do not fit with the brake lever