... .Non-toxic, medical grade PVC material; 2.size:5.0-8.5 3. endotracheal tube,reinforced endotracheal tube Description :product name:endotracheal tube ... with visible markings for easy observation5.size:5.0,5.5,6.0,6.5,7.0,7.5,8.0,8.5,9.0 endotracheal tube