Cherry seeds quickly absorb heat and release it gradually. A cherry pit cushion therefore stays warm longer than a hot water bottle. This 'dry heat bottle' relaxes and the pain disappears from the cramped muscles. This soft heat source is also ideal for small children. Composition Cover: cotton - polyester Filling: cherry pits Use Put this 'dry heat bottle' on stiff and stiff muscles for a few minutes. You simply heat them in the microwave. Not washable