RDAs are rebuildable dripping atomizers where vapers mount their coil builds. Once installed, wicked and juiced they attach the atomizers to high-powered mods. Saturating the wicks with more e-juice requires users to take off the top cap, and manually drip e-juice onto their coils.
The versatility of RDAs allows vapers to customize their style of vape to be more cloud or flavor-heavy. RDAs are only for experienced vapers. It takes skill and knowledge to know what wire material to use, how many times to wrap them, and how best to get the best resistance. There is also recognizing the proper wick material, the correct wattage to apply, and whether the mod supports a low, sub-ohm resistance.