Upon opening, the model presents atrium cordis, ventricles of the heart and cardiac valves. The size of this model conforms to the heart of about a 5-year old child, 3/4 size of an adult heart. Dissects into 2 parts. Removable from stand. Heart anatomy model size: 5" x 5" x 7-1/2". This is an original 3B model with a 3 year warrantee.