It comes with a base for study more clearly Made of environmentally friendly PVC, very safe to use Desirable Design. The heart model can be removed from the base for careful inspection of all sides. Safe Material. The heart model is made of environmentally friendly PVC, which is very safe to use. It can be removed from base to provide close examination of all sides Specifications: Material: Eco-friendly PVC Length: Approx. 21cm / 8.27inch Weight: Approx. 491g 1.Right atrium 2.Right auricle 3.Superior vena cava 4.Inferior vena cava 5.Right ventricle 6.Pulmonary trunk 7.Ascending aorta 8.Arch of the aorta 9.Brachiocephalic trunk 10.Common carotid artery 11.Subclavian artery 12.Arterial ligament 13.Descending aorta 14.Left auricle 15.Left ventricle 16.Right coronary artery 17.Anterior interventricular branch of left coronary artery 18.Circumflex branch of left coronary artery 19.Great cardiac vein 20.Middle cardiac vein 21.Small cardiac vein 22.Posterior interventricular branch of right coronary artery 23.Coronary sinus 24.Fossa ovalis 25.Opening of coronary sinus 26.Tricuspid valve 27.Pulmonary valve 28.Left atrium 29.Bicuspid valve (mitral valve) 30.Aortic valve 31.Left pulmonary artery 32.Left pulmonary vein 33.Right pulmonary artery 34.Right pulmonary vein Package Included: 1 x Heart Model 1 x Base 1 x Accessory