The Credo self-regulated humidification system is based on a physico-chemical process whose molecular mechanisms allow a rigorous water evaporation control. The principle is based on the creation of melange of water and tensio-active substances which limits the potential of the evaporation of the water itself. Le Tube is shaped like a cigar. 6" long with a 50 ring guage diameter. Just lay in your cigar box next to the cigars, and forget humidification worries.