Question 1

Is this sold for k cups

Accepted Answer

Twining's has 22 K-Cup varieties, but not the Pomegranate, Raspberry, Strawberry.

Question 2

Does it contain caffeine?

Accepted Answer

Does green tea with flavor contain sugar

Question 3

How much caffeine does this tea have?

Accepted Answer

The boxes only give ingredients, not nutritional info, which is pretty much the same for all teas & coffees.  However, the site gives good information for all teas, not just Twinings:

General, Tea Related
Does tea contain caffeine? 
How much caffeine does tea contain? 
Serving: 1 tea bag in 200 ml (7 oz) serving
Green : 25-35 mg/serving
White: : 25-30 mg/serving
Oolong: 35 mg/serving
Unflavoured black: 40-65 mg/serving
Flavoured black: 35-45 mg/serving
Caffeine occurs naturally in tea and coffee. It is a crystalline compound that is a mild stimulant of the central nervous system. The amount of caffeine in tea varies due to conditions where and how the tea plant (Camellia Sinensis) is grown, such as seasons when the plant is harvested, soil conditions, quality of water and growing temperature, to name a few. 
These values are for guidance only and they might vary depending on the amount of tea brewed in the tea bag, country of origin of the teas, and steep time. The longer  the steep time for tea, the stronger the extraction of caffeine.  Black tea is typically steeped for 5 minutes, Green tea is typically steeped for 2 minutes and White tea 1 minute. Additionally, the cup size or the amount of water does not affect the caffeine content.
Herbals like Peppermint and Camomile are naturally caffeine free because they do not come from the tea plant (Camellia Sinensis).

One of the more important statements is about the fact the caffeine content is the same no matter how much water, but increases with the steep time.

Hope this helps!

ASIN	B00I4B81IU
Age Range Description	6+
Benefits	Enjoy unique fruit flavor combination of Raspberry, Pomegranate, and Strawberry
Brand Name	Twinings
Caffeine Content Description	Caffeine Free
Container Type	Bag
Country of Origin	USA
Customer Reviews	4.8 4.8 out of 5 stars (294)
Flavour	Raspberry, Pomegranate,Strawberry
Global Trade Identification Number	00070177069216
Item Dimensions	7.9 x 6.9 x 13 centimetres
Item Form	Bags
Item Volume	16.9 Fluid Ounces
Item Weight	0.6 Ounces
Manufacturer	Twinings
Model Number	070177069216
Number of Items	20
Part Number	070177069216
Special Ingredients	Other Natural Flavours
Sweetness Description	Not Sweet
Tea Variety	Green
UPC	070177069216
Unit Count	20.0 count

Twining Tea Green Pomegranate, Raspberry, Strawberry, 20 ct

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