Manufactured from non-toxic, thermo-sensitive, transparent PVC with clear graduated depth markings and a black positioning ring. The strong tube walls ensure proper ventilation for patients. Supplied sterile in individual blister pack, for single use only. Features include high-volume, low-pressure, barrel-shaped cuffs, responsive pilot balloons, finely heat-welded cuffs, bull-nose tips, split-resistant radiopaque lines, smooth Murphy eyes and kink-resistant thermosensitive tubes. All tubes also have atraumatic hooded tips and smooth edges.