gold-filled wire ring. this ring can be squeezed or stretched to fit most of your fingers! It fits all of my fingers except my pinky. Sizes will be small, medium, and large to accommodate different people's needs but there is not exact sizing.
I wear a medium and my fingers are size 6-9 (excluding pinky).
small: fits 3-5; medium: fits 6-9; large: fits 8-11