This is the easiest way to brew loose tea, herbs, and infusions. These tea filter envelopes are easy to fill, due to the patented slide and are perfect for any teapot. Just fix the filter with the lid. When you are finished, just throw it away. Each box contains 100 filters and is suitable for 2 - 4 cup teapots. Made of chlorine- free, unbleached paper to ensure you only taste the flavor of your brew and nothing else.