The bit of a bridle is tamei. But the cheek-pieces [are] tahor. R’ Eliezer rules the cheek-pieces tamei. And the Sages say: Nothing is tamei except the bit. But when they are joined, everything is tamei.

A whorl [made] of metal, R’ Akiva rules it tamei, but the Sages rule it tahor. And a plated [whorl] is tahor. A spindle, a distaff, a rod, a symponia, and a flute, [if they are made] of metal, they are tamei. But [if they are] plated, they are tahor. [However,] if a symponia has a receptacle for [valves resembling] wings, it is tamei in either case.