Plastic animal cages provide warm surfaces ideal for housing laboratory rodents and are convenient to use and maintain. Autoclavable cage bodies are available in clear standard polycarbonate, clear polycarbonate with grommet (for access to sipper tube on rack), clear polycarbonate with cut-away bottoms (for removing waste products), high-temperature clear polysulfone (for repeated autoclaving and better chemical resistance), and polyetherimide (for maintaining superior strength and transparency after 1000 hours of autoclaving at 134°C (273°F)). Cage bodies are designed with corner lugs (side-arms) for stackable storage without scratching or jamming. Disposable polystyrene bodies are available in selected sizes; they are not autoclavable.