There are many kinds of 510 mouthpieces to choose from!
Formally referred to as "driptips" because with the old original products we actually dripped the liquid down the mouthpiece directly onto the coil before every puff.
Most 510 tips are designed for mouth-to-lung (MTL) or restricted-direct-lung (RDL) style hits and measure about 8.5mm size at the (stem/base) where it goes into the top of your tank.
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