Instant hot compress from Basic Medical Industries. Shake it up, locate the inner pouch and squeeze, shake again and you've got instant hot that you can now wrap in a soft cloth and apply. Soothes sore muscles, muscle spasms and joint stiffness. This is a single use, large hot compress that is 6" wide and 8.5" tall. We sell them individually so that you don't have to buy a case quantity. Contains: Magnesium Sulphate and water.