Sour berry: natural powder from mixed berries with a hint of sharp tartness, not too sweet and just enough sour to bring the flavor out.
Sour citrus: A mix of natural powder from pineapple and tangerine. This one has a nice zing. It's got the sweetness of those fruit flavors you know and love but the sour comes through really noticeably.
Both of them have flavor that lasts and doesn't irritate your cheeks or gums.
