4-stage cross section of an artery demonstrating altherosclerosis in which the narrowing of the artery is due to a built up of fatty tissue (cholesterol) and plaque. 4-stages: normal artery, fatty streak, fibrous plaque, and blockage. All stages rotate on hinge pin. Model size: (4) 1-3/8" dia. x 7/8" (3-1/2"). Card size: 6-1/2" x 5-1/4".