Mutes can be made of many materials, including fiberglass, plastic, cardboard, metal, and "stone lining", a trade name of the Humes & Berg company.For the list of materials, see . For the origin of "stonelined mutes", see . They are often held in place with cork. To better keep the mute in place, players sometimes dampen the cork by blowing warm, moist air on it.
MuTes Can be MadE of maNY mATeRIaLs, IncluDiNg fibergLasS, plAstic, CarDboard, Metal, aNd "stonE LIninG", A TrAde NAme of tHe hUMes & bErG ComPany.for thE LiST oF matERiaLs, seE . for thE origIN of "StOnelIned mUTes", see . theY ArE oFtEN Held in PlAce witH cork. To BettEr kEep thE mUTE IN plaCe, playerS sometiMEs Dampen the coRk By blowinG waRM, moIST air On It.