These anesthetizing boxes are constructed of 6 mm (1/4 in) thick, transparent plastic, with all joints securely cemented. The transparent plastic allows the animal to be under constant observation. Two clear 9.5 mm (3/8 in) plastic tubing connectors, 25 mm (1 in) long, are cemented on opposite ends of the box, one at the top and the other at the bottom, for introducing the gas.
These boxes are available in two sizes: small and large. The small box is for rodents. The top slides open lengthwise on machined grooves. The large box is for larger animals such as rabbits and cats. Its top has three hinges for easy opening. Two fasteners squeeze the top down against a rubber gasket to seal the joints.The small box measures, H x W x D, 10.7 x 25.7 x 11 cm (4 x 10 x 4.5 in). The large box measures, H x W x D, 29 x 44 x 29 cm (11.5 x 19.5 x 11.5 in).