Reflector can effectively illuminate the lamp light It can be used according to your breeding environment. Product Size (W x D x H): 8.0 x 6.2 x 3.7 inches (20.3 x 15.8 x 9.5 cm); Compatible Models: Glass Terarium Nano / Nano Cube for W7.9 inches (20 cm) Cages, Individual Size (W x D x H): 8.4 x 7.7 inches (213 x 105 x 691 mm).