Rear system(MTB) (1)

Option: 1, Right shifter(display): Right shifter (SL-M4100,10 Speed,optical display) 2, Right shifter(no display): Right shifter (SL-M4100,10 Speed,no optical display) 3, Rear derailleur: Rear derailleur (RD-M4120) 4, Full set(2PCS,display): Right shifter...