The internal bore diameter on the 18cm SGM (19/22) is 17mm, and is suitable for microphones from 19-22mm diameter. The Sennheiser ME66 K6 is just slightly larger than 22mm, so we introduced the 18cm ME66 SGM foam specifically for that model of microphone. The bore on the ME66 foam is 20mm, so it's suitable for mics from 21-23mm in diameter.
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