Kadee(R) All-Metal Non-Magnetic 2-Piece Self-Equalizing Trucks are ideal for many O Scale freight car applications. Each pair comes with 33 or 36′ smooth-back P48 metal non-magnetic wheels (as noted in the product name) blackened wheels with free-rolling insulated axles. Trucks feature clip-on pads and brake rigging, and each pair includes mounting adapters for Protocraft and Atlas models. All-metal freight car trucks are part of the line of Kadee O Scale couplers, trucks and accessories. WARNING: This product can expose you to chemicals, which are known to the State of California to cause cancer and birth defects or other reproductive harm.