The main wearing parts of the Zodiac MX8 Pool Cleaner are included in the kit. Includes: - 1 x MX8 Replacement Engine - 2 x Large bearings to fit onto Engine - 2 x MX8 Drive shaft - 1 x Gearbox A - 1 x Gearbox B - 1 x Track Set of MX8 Wheels What's in the box 1x Gearbox Side A, 1x Gearbox Side B, 1x Engine Assembly, 2x Tracks, 2x Large Bearings, 2x Drive Shafts