Composition of Nova-T :
NOVA-T can be distinguished by a silver core over which the copper wire is wrapped. It has silver added to copper wire increasing it's life span to 5 yrs. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd EDITION PAGE NO 496 Shaw's textbook of Gynecology - 17 th edition, page no. 258.
Copper and silver
Copper only
Copper and selenium
Copper and molybdenum
Contraception