The twig ring shanks are solid sterling silver raw castings that are solder ready or can be tumble finished to use in your designs as links.
Approximately 13/16 inches or 2.1 cm outer diameter and 5/8 inch or 1.7 cm inner diameter. They tap out on a ring mandrel to a US size 5 without smoothing out the inside.
Find smaller twig rings here: https://www.etsy.com/listing/97395209/twig-link-rings-twig-connectors-raw
This is NOT pmc. My components are cast in solid sterling silver using the lost wax casting method.