Microlaryngeal Tracheal Tube, Size 4.0 mm. Standard I.D. and O.D. on a longer length tube provide greater access to surgical field. Smaller diameter is beneficial where airway has been narrowed by a tumor or other abnormality. Standard features high-volume, low-pressure cuff Murphy tip and eye full Magill curve smooth beveled tip. Catheters with a radiopaque line, sterile, latex-free.