Boveda 62% Humidification Packs are the perfect way to keep your cigars at the right humidity level. These wonderful devices are set at ideal humidity levels and you simply chose the one the best fits how you like your cigars. Each Boveda is a two way systems that will not only add humidity to the air inside your humidor, but if you are in an area with excess humidity, it will absorb it as well. The 8 gram units are great for the smoker on the go. Made to fit inside a travel humidor, the smaller Boveda packs work to properly humidify 5-10 cigars and on average will last 60-90 days before needing to be replaced. Good for 5-10 cigars Last 60-90 days once in use on average Shelf Life of 1 year in original packaging Two Way System for Keeping Humidors at Ideal Relative Humidity Dimensions: 2.75” x 2.5” This product contains 10 of the small 8 gram packs. Each 8 gram pack will humidify approximately 5 cigars for 1-3 months depending on ambient conditions.