Sustaining the suitable humidity vary with little hard work is a snap! This two oz. jar is filled with exceptional pre-charged water absorbing gel crystals. These jars can be used As well as your humidor's existing humidifiers or by them selves. To employ, simply twist from the cap & location the jar in your humidor. https://medium.com/@refinedtraditions/the-ultimate-buyers-guide-to-humidor-cabinets-09e99f97a801