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The proximal tube is 304v stainless steel. The distal coaxial tubings are high-density polyethylene. The lumen of the shaft is used for the purpose of inflating and deflating the balloon. A second lumen at the distal-end of the delivery system is used for advancing the guide wire. The semi-compliant balloon has an approximate diameter growth of 10% from nominal pressure to rated burst pressure. Gold radiopaque bands are used to locate the balloon under fluoroscopy. The balloon is rated to 16 Atm burst pressure (14 Atm for balloons of 4.0 mm diameter