Walthers Part # 380-533, 
HO scale, 

 
Ribbed wheelsets are most commonly found on steam era rolling stock. Kadee wheelsets are manufactured to the most exacting standards and feature: RP-25 contour, non-magnetic metal wheels and insulated needlepoint axles.
 
Wheelset Features:
 
* Code 88
 
* Accurate markings
 
* Incredible detail true to prototype
 
* Non-magnetic metal wheels
 
* Smooth tracking free rolling contoured insulated axles
 
* RP-25 free rolling wheels
 
* Needlepoint Axles
 
* Freight & Passenger