Sour Apple -  Take a bite from the sour apple–savior the wonderful flavor notes you'll get off this apple profiled e-liquid. lusciousness of an apple with a sweet sugary flavor! NKTR Sour takes fresh-fruit, flavors and gives them a twist that you can taste from the beginning to the end. [TFN ® Nicotine] is the only authentic manufactured brand of nicotine not derived from tobacco leaf, stem or waste dust. Nicotine is odorless & smooth and enables a purer and more sophisticated taste profile.