Bachmann G Scale Metal Wheel Sets are replacements for wheels used on many Bachmann Large Scale freight and passenger cars. This package includes four metal wheelsets mounted on axles with blunt metal ends. The wheelsets operate on standard G Scale 1-3/4′ 45mm gauge track.WARNING: This product can expose you to chemicals including Lead, which is 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