0.75 inch (19mm) of width is certainly worth to be tried, please. And, 4.75 inch (120mm) diameter + stretch is certainly appropriate measure for those silicone bands. Sorry for my misunderstanding.
What you get: “5 or 20 7.5 x 0.75 x 0.125 Inch flat, 15 inch circumference, 4.75 inch diameter”.