Thank you for looking. These are dichroic glass (expansion coefficient 90 degrees) nuggets. The nuggets are approximately 1.7 to 1.89 centimeters in diameter. I think they can be used in various ways, such as for making hair ties or pendants. Some of them contain small bubbles inside. Please refrain from purchasing if you are concerned about this. If you would like multiple items, please let me know in advance. Depending on the quantity, I will offer a discount and relist them together.