1. Made of medical grade PVC, have good biocompatibility, non-toxic. 2. Exclusive soft seal cuff can be insert comfortable, minimizing potential trauma and increasing sealing. 3. Strengthen neck and tip eased insertion and prevents folds. 4. Kink-free tube eliminates the risk of airway tube occlusion. 5. Have different sizes, suitable for neonate, infant, child and adult. 6. Supply for custom-made.