This is a glass storm glass, designed to allow observation of crystal changes. - Model Name: Fun Science Storm Glass - Material: Glass - Features: Observation of crystal formation - Size: Shown in the image Thank you for viewing. Purchased on Rakuten in the fall of 2025. It's a popular item, as it has sold out many times. I displayed it because it was cute, but I removed it quickly because my child would play with it. It has been stored at home ever since. I will also include the Francfranc coaster that I used when displaying it.