The only heart model which gives you all these pluses: enlarged to twice life-size for ease of observation and demonstration, making it perfect for patient education attachable/detachable bypass vessels let you demonstrate single, double, triple coronary bypasses demonstrate LIMA bypass employing the left internal mammary (internal thoracic) artery demonstrate bilateral IMA bypasses utilizing both the right and left internal mammary arteries full internal access to all heart chambers and valves even with bypass vessels in place and configure model as a normal healthy heart by simply detaching all bypass vessels. Use the bypass tubing, complete with built-in quick-connects, to instantly install single, double, or triple bypasses, representing grafts of the saphenous vein of the lower leg, to connect the ascending aorta to the coronary arteries. To demonstrate the anatomy of the normal healthy heart, simply detach all bypass vessels. Overall dimensions: 7 in. x 7 in. x 17 in.