These are Self-Centering Arch Bar Truck with 33" Ribbed Back Wheels from Kadee.FEATURES: 33" ribbed back wheels "HGC" weights the nearly the same as metal trucks Superior rolling ability Brake pads Accurate markings Incredible detail true to prototype Non-magnetic metal Wheels Highly flexible fully equalized trucks Smooth tracking free rolling contoured insulated axles RP-25 free rolling wheels Only use Dry Graphite Lubricant (KADU0231) Instruction includedINCLUDES: One set of Self-Centering Arch Bar Truck with 33" Ribbed Back WheelsREQUIRES: InstallationSPECS: Scale: HO 1/87KadeePart KAD561