The perfect way to make tea! The simple principle of this invention is hard to believe and yet so easy! The perfect, simple and save way to make your tea directly in your favorite cup. BPA free! Instructions: Fill a tea spoon loose tea into the filter and brew with hot water. Let steep for 3 minutes and place filter on top of a mug and watch how your mug fills itself within seconds. Simply lift filter from mug, the flow is stopped in an instant.