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Part of the Italian proof making is bore size. They are stamped on the left side of the barrel in mm.

approx. 18.4 mm =0.724", 18.7 mm =0.736", 18.8 mm (max. allowed)=0.740"
 

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All six tubes in our Optima-barreled combos mic between .730" and .732".

Ed
 
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