Number of links on a side:
Recommended ring sizes: 6:21 and 10:19 6:20 and 11:19 6:20 and 10:19 (extra stiff) 7:20 and 11:18 8:19 and 12:17 9:18 and 14:16 10:17 and 15:15 11:16 and 17:14 Custom Ring Sizes
Metal for small rings: Sterling Silver Niobium Gold Fill Jewelry Brass Copper
Metal for large rings: Sterling Silver Niobium Gold Fill Jewelry Brass Copper