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. For more information go to www.P65Warnings.ca.gov