This is a 250g (about 9 oz) brick of 10-year aged and fermented Pu-Ehr Chinese tea from Yunnan Province. Rich in probiotics, it may assist in blood sugar control. It is a mild tea and won't interfere with ni9ght sleep, while aiding in digestion. This is a particularly tasty tea to me, especially when sweetened with sugar or honey (my own taste of course). This is a true treasure from China and I will enjoy it tremendously.