Mugen 46T differential conical gear for use on the Mugen 1/8 MBX6T Truggy Kit is constructed of steel. Since the Mugen MBX-6T requires special gear ratios for the differentials due to the lager diameter wheel on a Truggy over a buggy you will need these 46 Tooth ring gears. Super strong and super smooth these are some of the examples why Mugen competition kits are considered some of the highest quality in the business.