These Numero 3 "Tampon" Filter Pads - (as stated on the packet) are designed to ensure the extraction of a high percentage of Yeast from your Homebrew. . . . . . Please don't be put off though, the "T" word descends from the French Word "Tampion" meaning - a piece of cloth to stop a hole . . . . . that's any Hole! yet another fascinating fact from Wikipedia, helping to further Clarify the Mist surrounding this brilliant Filtration System!