RDA e-cigs

RDA is short for "Rebuildable Dripping Atomizer", typified by a short, 510 base threads at bottom, and two posts (positive and negative) on its top (deck), sufficient to hold a coil or coils, with a juice well to drip juice into via the drip tip. Often the most flavorful, and most often used for sub-ohm vaping.

To rebuild it, you take some wire (like Kanthal), wrap it several times around cotton wick and connect the wire to both posts, then drip the e-liquid to the cotton wick and ready to use.

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