Shungite protects from EMF. It neutralizes tension and stress. These come from Karelia, Russia. Check the measurements next to a quarter, which is approximately one inch. The price listed is for one hundred grams of elite Shungite (sample amount pictured).
If you want to use these to purify water, the ratio is one hundred grams of elite Shungite for every liter of water. Please be sure to follow appropriate protocol for purifying water. This video has a great explanation for it: https://m.youtube.com/watch?v=HDB9VlcTw6M.