I would NOT recommend this product.
I was given this as a gift and was looking forward to trying it. It's almost impossible to fill it with water and not have it leak. I had filled, it wasn't leaking, put it in the freezer and it promptly started to leak. The glass is fine but they need to have a better design for the ice ball. Also, the one time I did get it to freeze without leaking, the ice did not last very long at all. I'll keep the glass but the ice ball is either getting put into storage or more likely thrown away.