The facet at the end of the patient has a standard angle and melts smoothly without tendrils. Murphy's eye border is smooth, without a sharp angle. The cuff is soft, long, and wide. The peculiarity of large volume and low pressure can reduce mucosal trauma. The connection between the cuff and the main tube is smooth and without a sharp angle, and the likelihood of mucosal injury can be minimized during insertion. The tube is made of heat-sensitive material, it will become soft after introduction into the trachea without tracheal injuries. The hardness and elasticity of the tube are moderate, therefore it is difficult to bend the tube. Features: 1. The facet at the end of the patient has a standard angle and melts smoothly without tendrils. 2. Murphy's eye border is smooth, without a sharp angle. 3. The cuff is soft, long, and wide. The peculiarity of large volume and low pressure can reduce mucosal trauma. 4. The connection between the cuff and the main tube is smooth and without a sharp angle, minimizing the likelihood of mucosal injury. 5. The tube is made of heat-sensitive material, it will become soft after introduction into the trachea without tracheal injuries. The hardness and elasticity of the tube are moderate, therefore it is difficult to bend the tube.