Silicone Endotracheal Tube with Wire Reinforcement. Silicone is a great material for endotracheal tubes because it provides superior biocompatibility and flexibility. These tubes have a metal wire reinforcement that spirals the length of the tube. This reinforcement gives rigidity and prevents any possible occlusion. Features: *Graduations to aid in the depth placement. *Radiopaque line for location confirmation. *Fully transparent to allow observation for development of blood mucus. *Lateral Murphy eye. *15mm connector included. J0629D 5.0mm i.d. x 7.3mm (22Fr) o.d. x 240mm long. 4.0mm/12fr o.d.; 140mm L.