● It is made of imported medical silicone material, which is convenient to insert and can quickly establish airway. ● The bending radian peculiar to the supervisor is in line with human physiology, which improves the comfort and safety in use. ● With rucksack for better sealing. ● The double tube laryngeal mask has a drainage tube, which can be inserted into the gastric tube to prevent flatulence, reflux, and aspiration.