1)series undercarriage 2)different sharp used for different earth condition 3)competitive ... , JCB, WOLVO, ect. High quality, Top delivery, Low price!UNDERCARRIAGE, :-Track shoe,undercarriage,grouser shoe -Color: black or yellow-Material: 23MnB,25MnB,25CrMnB ... ) Sumitomo: SH120, SH200, SH280, SH300, SH400 8) Mitsubishi: MS110, MS180 undercarriage part, idlers, Track roller