Shungite is high in carbon so is excellent it helping to protect the body from Electromagnetic fields from cell phone towers, cell phones, and electrical devices. Shungite is only found in one place in the world and that is Russia where it is thought that a meteorite landed there and Shungite is the meteor.
Shungite is very earthing and helps to ground a person. Thought to help improve energy levels of the wearer, relieve pain and soothe insomnia. This would be due to the earthing effect of carbon.
If you wish to see an excellent movie of Earthing https://www.youtube.com/watch?v=44ddtR0XDVU&t=21s
These bracelets vary in size of bead due to being a natural stone but are around 8 - 10mm.
Scientific study https://pubmed.ncbi.nlm.nih.gov/14968159/