Ice ball trays are made of silicone. They ice does not stick to it so that makes it really easy to get the ice out of the mold that it is in. You can do a lot with this tray, put fruit in there and have fun drinks for a party or something. I really like this tray I had the plastic ones and so many of them broke when I tried to get the ice out of the tray.
I am now going to get a silicone tray for now on there are better than the plastic ones and last a lot longer. They ice melts slower than the regular balls. You can also try them in adult drinks as well.
You can pick you tray up here