Which teas in this set are caffeine free? Also, what is fermented tea?

All the ones that I buy have caffeine.

May I know the amount of caffeine in each of those eight teas? Not just five of them

We would like to share the feedback of our marketing team with any additional questions you may have. when calculating the dosage, it is about 8 to 13 mg (based on 1 cup). The caffeine content is due to the capacity of the tea leaves, There is no significant difference in the amount of tea leaves in the eight tea bags, so you can consider the caffeine content we introduced to a similar level. It is difficult to calculate the exact amount of caffeine consumed as leaching tea can vary depending on the drinker's drinking habits (temperature, time, type of water), etc. Please note that depending on the brewing method, there may be variations in the amount of caffeine provided. Hope this answer helps.

There are several different scents. Each of them tastes great. I love these teas so much. I enjoy listening to music in the afternoon and enjoying these scents.

Which of the tea is caffeine free?

Only herbal teas are caffeine free. Of the teas the white tea is the one with the least amount, bust still has a bit; and the black tea is the one with highest amount.