it is adjustable up to maybe size 10. you can squeeze the band together to make it smaller or pull it out to make it larger. the band in not a thin band, it is a medium width and very sturdy and comfortable. it is not a cheap piece like out of a gumball machine, it was bought in Arizona on a reservation when I was 8, i am 55 now. so it is vintage and still a very nice ring. Thank you for looking.