These tea bags come sealed on three sides and open on the fourth side so that they can be filled and sealed manually using a spoon and an appropriate heating device e.g. iron, flat iron, etc. The tea bag filter papers are unique and designed using a combination of natural and man-made fibres . This helps to improve heat seal ability, achieve excellent infusion, while at the same time guaranteeing high retention of fine tea particles. Our tea bag filter paper is the same tea bag filter paper that is used by the largest tea companies in the world.