Size: Diameter 7.5-9.5mm Total weight: 100g These items have been in long-term storage since they were purchased a long time ago. Material unknown. They don't seem very strong, so if you're stringing them together, it's best to use knotting between them to prevent them from bumping into each other. Some release agent remains inside, so wipe it off gently if it comes out. Generally in good condition, but there may be some scratches, wear, and discoloration due to long-term storage. #Aochans #Material #Glass #Matte #Black #Beads #Tonbodama (glass beads)