What comes with the package: 

Compatible with Titan X Carbon / Balrog X / Balrog S

• The kits including

4 Pcs x 7" Hota Inflatable Wheel black
2 Pcs x Drive Gears 66T ,plastic
2 Pcs x Drive Belts  HTD 5M 375mm
Bearings assembly in the wheels / gears

Compatible with Titan 4WD

• The kits including

4 Pcs x 7" Hota Inflatable Wheel black
4 Pcs x Drive Gears 66T ,plastic
4 Pcs x Drive Belts  HTD 5M 375mm
Bearings assembly in the wheels / gears

Compatible with Hercules Carbon 

• The kits including

4 Pcs x 7" Hota Inflatable Wheel black
2 Pcs x Drive Gears 66T ,plastic
2 Pcs x Drive Belts  HTD 5M 360mm
Bearings assembly in the wheels / gears