<prompt> Composition of Nova-T :Copper and silverCopper onlyCopper and seleniumCopper and molybdenum  <response>: NOVA-T can be distinguished by a silver core over which the copper wire is wrapped. It has silver added to copper wire increasing its life span to 5 yrs. PARKS TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd EDITION PAGE NO 496 Shaws textbook of Gynecology - 17 th edition, page no. 258. 