Keurig brewed. For use in Keurig brewing systems. For three generations, the Bigelow family has specialized in creating deliciously different, world class teas. To make our all natural Green Tea, we use fine quality tea from high elevation gardens that has been gently processed to bring out the tea's delicate, smooth flavour. - Eunice & David Bigelow. 100% green tea packed in K-Cup portion packs. Caffeine Meter (represents average caffeine content; individual products may vary): Coffee: 100-120 mg. Black Tea: 30-60 mg. Green Tea: 25-50 mg. Decaf Tea: 1-8 mg. Herb Tea: 0 mg.