This is a replacement FastEddy Arrma Big Rock 4X4 3S Sealed Bearing Kit.
Includes:
(2) 5x8x2.5
(4) 6x12x4
(8) 12x18x4
(7) 10x15x4
(4) 5x10x4
(1) 15x21x4
You are purchasing the bearings listed above.
In many cases the bearing sizes may change depending on your particular model and the date that it was manufactured as well as different hop ups you may have installed.PLEASE DOUBLE CHECK you R/C before ordering to make sure you are get all the proper bearings.