Reference for Kelim 11:6

פִּיקָה שֶׁל מַתֶּכֶת, רַבִּי עֲקִיבָא מְטַמֵּא, וַחֲכָמִים מְטַהֲרִין. וּמְצֻפָּה, טְהוֹרָה. הַכּוּשׁ, וְהָאִימָּה, וְהַמַּקֵּל, וְסִמְפּוֹנְיָה, וְחָלִיל שֶׁל מַתֶּכֶת, טְמֵאִין. וּמְצֻפִּין, טְהוֹרִים. סִמְפּוֹנְיָה, אִם יֶשׁ בָּהּ בֵּית קִבּוּל כְּנָפַיִם, בֵּין כָּךְ וּבֵין כָּךְ טְמֵאָה:

A metal spindle-knob: Rabbi Akiva declares it susceptible to impurity, but the Sages declare it not susceptible. If it was only plated [with metal] it is pure. A spindle, a distaff, a rod, a double flute and a pipe: if they are of metal they are susceptible to impurity, but if they are only plated [with metal] they are pure. A double flute: if it has a receptacle for the wings it is susceptible to impurity in either case.

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