The tahor [parts] of a wagon [are as follows]: A yoke that is plated, tips made for ornamentation, tubes that produce sound, the lead [spheres] on the side of the animal’s neck, the rim of the wheel, the [metal] sheets, the plating, and all other nails are tahor. The metal shoes of animals are tamei, [but those made] of shaam are tahor. At what point does a sword become susceptible to tumah? When one polishes it. And a knife [becomes susceptible to tumah] when one sharpens it.