WalthersProto HO Scale 36 Turned Metal Wheelsets with Metal Axles are a fast and economical way to upgrade your equipment. These 12-packs of wheelsets are great replacements for those used on most freight cars. 36 Turned Metal Wheelsets are part of the line of WalthersProto HO Scale trucks, wheels and couplers. High quality turned metal wheels for improved performance Easy upgrade for most HO equipment Standard wheel size fits most freight and passenger equipment Fits steam, diesel and modern-era rolling stock Ultra-smooth rolling metal needlepoint axles Fully-assembled and ready to use Insulated on one side Converts up to three cars