This is plain loose-leaf green tea sold in a 100 g bag. According to the pack label, green tea is the only ingredient, with nothing added. The leaves are tightly rolled and slowly unfurl once they meet hot water.
The label suggests adding two tablespoons of leaves to two glasses of water, boiling for 15 minutes and then letting the tea stand for two to three minutes before drinking. Many people prefer a gentler brew with water that has just come off the boil and a shorter steep, so feel free to adjust the strength to your own taste. In Turkish homes green tea is often served after a meal, with a slice of lemon or a spoon of honey, and it is just as good poured over ice in summer.
Close the bag firmly or move the leaves to an airtight jar, and keep it in a cool, dry cupboard away from sunlight and strong smells so the aroma stays clean.