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Boveda's 4 gram packs are the appropriate size for smaller enclosed spaces, like small pill jars and baggies.
Boveda is scientifically engineered to maintain a precise relative humidity in an enclosed space, and our 4 gram size is available in 62 percent RH.
Each Boveda consists of a specially prepared saturated solution of pure water and natural salt. This saturated solution is contained within a water-vapor permeable "reverse osmosis" membrane. Within an enclosed container, Boveda maintains a predetermined level of (RH) by releasing or absorbing purified water-vapor as needed through the membrane.
Boveda provides the cleanest and most purified humidity of all other products available on the market today.
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