These Water Beads are super absorbent polymer crystals that expand to absorb up to 100 times their weight in fluid. The 1 oz package will provide proper saturation for the 1/2 gallon tank of the Cigar Oasis Magna, Cigar Oasis II-XL. Add the beads to the water tank, fill the tank about 3/4 with distilled water. The beads will expand as they absorb the distilled water. As your cabinet loses humidity and moisture content, the beads shrink. Refill the reservoir with distilled water and they will expand and continue to humidify your cabinet. Water beads should be replaced annually.