With this purchase, you receive 100 - Large Heat Seal Tea Bags Measurements: Size: approximately 4 x 5" AKA Press & Brew Bags Heat seal tea bags are often used for tub teas or drinking teas, but they are versatile enough to be used for samples, sachets, spices, bath salts, potpourri and so much more. Perfect for a "mess-free" infusion in your simmering pot! Simply fill with desired product & seal with a household iron, hair straightener or heat sealing machine fpr 15-20 seconds while pressing firmly. Sealing temperature is between 302-338F (150-170C) Items may expand when wet, so overfilling is not recommended. Food grade, white colored, durable fiber heat sealable bags. No bleaching agents or formaldehyde used in the processing of this product. The tea paper is made of a special blend of thermoplastic fibers, abaca, and cellulosic fibers. This tissue has a high wet strength with neutral odor and flavor characteristics making it a highly acceptable media for bagging tea.