The product is one size, the ring width is about 11mm
Finger circumference: adjustable between 49.6-56.2MM, both male and female.
Silver reacts with sulfide to turn black, so please remove the ring when you are in hot spring or bath with sulfur soap.
Please keep the silver ring sealed when you are not wearing it. Silver will oxidize and turn black after a long time, but you can use a little toothpaste to make it clear and bright.