The cup and cover are hardened and zinc plated.
. Hudson bearings is an innovative domestic manufacturer of ball transfers.Hudson bearings nmbt-5/8cs 5/8 nylon ball carbon steel machined drop-in ball transfer 5/8 inch nylon main ball rotates on a bed of 3/32 inch carbon steel support balls in a carbon steel machined cup. Hudson Bearings 5/8in Nylon Ball Carbon Steel Machined Drop-In Ball Transfer the mbt ball transfer features a machined housing that is hardened and plated with a stamped metal cap.