There are a few significant differences between dab rigs and dab pens, but the most notable difference is that most dab rigs aren’t ‘vaporizers’, as they do require the need of flame such as a torch or a high power lighter.
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They’re usually quite similar to bongs, except they’re equipped with special features that make dabbing much easier than it would be with a traditional bong. Not to mention, dab rigs are typically much larger than most vaporizers, and basically the opposite of a dab pen in that sense.