The ring in stainless steel. This model came from Shapeways with a bit of residue stuck in the cracks between stitches. I removed the excess material with a needle.
It's like a sweater for your finger! This ring is made from three rows of stockinette stitch (actually three closed loops, but I won't tell if you don't). The ring has an inner circumference of 59mm, which makes it about a size 9 in North America.
2.25 w x
1.128 d x
0.886 w x
0.444 d x