Toggle Loop is 15.7mm, inside diameter is 11.7mm, loop is 3.5mm Bar measures 23.3mm, loop is 3.5mm Flat Twist design 14 karat Gold Filled is composed of a solid layer of 14 karat Gold mechanically bonded to copper or brass. Thicker than plating so it will not chip or wear away. Treat just like solid 14kt gold, in terms of care & cleaning