Model of Kidney Vessels (Red The corrosion cast of the kidney vessels contains a real pig’s kidney and is embedded in crystal-clear plastic. The size and macrostructure of pig’s kidneys resemble those of human kidneys. Detailed spatial portrayal of vessel arborisation and progression is very well illustrated by the red arterial flow areas. Each of the pig kidney specimens is unique and therefore varied in shape. The Kidney Vessels is a great addition to any classroom or doctors office.