ecigarette-or-vaping-products-visual-dictionary-508

• Just a simple supplement，after 2nd generation and before 4th generation，rda and mechanical mod was very popular on the market.
• there are various styles.below show some pic for your ref. can recall your mind？
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  various rda tank and mechanical mod 20140808

  • If Call these e-cigs made with SS is 2.5 generation or 3.5 generation，which one you feel better？