This product is final sale. Boveda’s patented two-way humidity control responds to ambient conditions by adding or removing moisture to affect the enclosed environment and deliver the pre-determined relative humidity (RH) level printed on the pack. When Boveda is completely dry, it will turn into a solid wafer—when there are very few soft spots left, you’ll want to replace it. Available in either a single 67 g pack, a 10 pack of the 4 g and a 20 pack of the 1 g Boveda.