All true about armoured endotracheal tube except

Just likestandard ET tubes,armored or reinforced tubes have the typical left-facing bevel tip and Murphy eye. Their distinctive feature is ametal wire coilembedded in the wall of the tube shaft. The fact that these tubes contain a metal wire coil means there is no need for a radio-opaque line. Useful in head and neck surgeriesand when the patient is in a prone position.