Commercial-quality materials and superior manufacturing mean cages are built to last a lifetime. * Multiple doors for easy access from both side and end of cage. * Cages are "suitcase" style, which means when you need to take them down, they simply fold/collapse. * ABS composite tray is durable, super easy-to-clean, and unlike cold and noisy metal trays, will not stain, rust, warp, corrode or retain pet odors. * Size guide: 20-inch cage is 20x13x16, 24-inch is 24x17x19, 30-inch is 30x18x20, 36-inch is 36x22x25, 42-inch is 42x27x30, 48-inch is 48x29x32. Gauges range from 5 to 9.