"Open air" environment provides essential ventilation, as well as allowing for penetration of beneficial UVB and UVA rays during outdoor sunning! PVC plastic-coated wire helps prevent injuries associated with nose rubbing, skittishness and stress, as well as foot injuries in chameleons and other climbing reptiles. Complete with ceramic fixture(s) for incandescent heat items and fluorescent fixture for UV lighting. Comes with basking shelf and enclosed wire "heat cage" to prevent animals from gaining access to hot bulbs and heat emitters. IA-20 and IA-30 come with "Repti Rollers" for easy movement (roll your reptiles outside to "sun".) Easy to clean, removable, galvanized steel base tray. Shipped flat (knockdown) and comes with pull ties and simple instructions for easy assembly. If you take your reptile outside for natural sunlight exposure, be sure to place cage in an area out of direct sunlight, provide adequate shaded spots and monitor your reptile at all times to prevent accidents due to heat exhaustion. Item# IA-20 Medium Size (30L"X18W"X30H") Item# IA-30 Large Size (36L"X18W"X48H") Medium and Large Sizes come with two incandescent and one 24" fluorescent fixture (lamps not included), and "Repti Rollers."