Bit Bank International, Tongue Saver Universal Gag - This is a Universal Gag with lozenge and a shaped mouthpiece Centre ring 75mmTop ring 25mmBottom ring 45mm DiaOverall shank length 135mmMeasurements are approximateThis is a 12mm diameter mouthpiece in German Silver, mouthpeice size per the title - there is a conversion chart to imperial measurements below Tongue Saver Properties, 

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