These are intended to be used for Freight Wagons. They are not designed to be used for Passenger Haulage. They come with 4 side frames and 2 bolsters for $155.00. No axles, wheels, or bearings are provided. They can be used with In Line Roller Skate Bearings (22 O.D. x 8mm I.D. x 7mm Wide). We sell these for $14.00 a set of 4.