Medium Terrarium Background KitBuild a custom bioactive terrarium background for a 15-gallon enclosure, a 20-gallon vertical or horizontal enclosure, a 12 x 12 x 24 inch terrarium, or an 18 x 18 x 18 to 24 inch terrarium. Use the included materials to shape cork backdrops, planter pockets, and other 3D habitat features with The Bio Dude background method.What's included 2 black 12-ounce expanding insulating foam cans 2 tubes of clear aquarium-safe silicone, 10.2 ounces each 5 black 2-inch net pots 2 cork bark flats, 8 to 10 inches 2 bags of The Bio Dude Background Blend, 6 quarts each Build notesThe Background Blend creates a textured surface that helps hold moisture for plant roots. Materials can be used to create a one-of-a-kind planted backdrop, and your finished design may leave some material unused.Shipping note: Because this kit contains silicone and expanding foam, it ships by ground or Home Delivery only. Express and air shipping are not available. The sealant brand may vary.