Don’t know. These little glass ball with tags hanging from them were part of a thermometer where the the one with the tag reading the temperature for the day either floated to the top or sank to the bottom. I can’t remember. The tube they were housed in broke but I liked the balls with the colored water in them so I kept them. They’re usually in a glass dish. My get pushed challenge was to do something weather related. I couldn’t think of what because the weather here right now doesn’t look like anything. It’s been cold lately but today it’s sunny and nice.