The object is a Silicon Graphics "Power Series" CPU in a 15 Slot Twin Tower box. The big short tower houses the system boards and has all the external connectors on its back. It includes one IP9 board with a 25 Mhz MIPS R3000 CPU chip and one fully populated MC2 memory board. The small tall tower houses the internal drives. The drive tower is a modular stack of 5 drive bays with a power supply at the bottom.