Worn alone or stacked together, these rings are one of our most popular sellers. They measure about 1 mm in width, they're thing but not too thin. We make these specific rings using fine .999 sterling silver (99.9% pure silver vs 925 silver which is just 92.5% silver) They're completely hypoallergenic/allergy free. My favorite thing about fine silver is that it is a nice bright white color and tends not to tarnish as easily. If your ring is looking a bit dull, you can easily brighten it right up with a basic jewelry polishing wipe. We make these rings in any half, whole, or quarter size from size 2 through size 13. We more than happy to make larger sizes but will need a small fee to do so.