The base of smiths is tamei. But that of a blacksmith is tahor. A sharpening board that has a receptacle for [holding] oil is tamei. But [a sharpening board] that does not have [a receptacle] is tahor. A ledger that has a receptacle for [holding] wax is tamei. But [a ledger] that does not have [a receptacle] is tahor. [Regarding] a straw mat or a straw tube, R’ Akiva rules it tamei, but R’ Yochanan ben Nuri rules it tahor. R’ Shimon says: The same applies to colocynth. A mat of reeds or of sedge is tahor. A reed tube that was cut for the purpose of being used as a receptacle is tahor until one removes all of the pith.