I made this terrarium entirely enclosed, with a hinged door to get inside. By keeping the door closed it creates a micro-environment, & within a few days it will feel slightly humid inside the glass. It will arrive as a kit, with almost everything you need to get started. The kit is made up of a muslin pouch with pebbles, activated charcoal, rubber feet, & a few suggestions for how to get your terrarium started. Terrariums are made using glass & a lead-free, silver alloy solder. If you want to plant moss inside I also provide some tips on moss foraging. Besides moss, this is a great style for any humidity loving plants or air plants. This terrarium comes in silver or with a copper patina. Measurements Width: 4.25″ Depth: 4.25″ Height: 3.25″ for more terrariums check here Universe Terrarium Kit, Small Dodecahedron Glass Terrarium With A Hinged Door Stained Copper Or Silver Color Eco Friendly