The humidifying plate by Boveda can be used freely inside the Humidor or in combination with the dedicated support (you can find it in our eshop). The Boveda plate consists of a saline solution with pre-calibrated humidity contained in a semi-permeable membrane that allows it to yield or acquire moisture depending on the climatic situation inside your humidor. Boveda is an intelligent, healthy and practical solution for humidifying both static humidors (boxes or display cases) or travel humidors or cigar cases. The Boveda bags do not allow the humidity of your salty humidor beyond the pre-calibrated humidity. The bags are of different sizes and with different pre-calibrated humidity levels. Refer to the product title to see weight and moisture. The bags are supplied in sealed plastic bags that protect their integrity and moisture until they are opened. Made in the USA.