Christmas Time Death Star Silicone Tray
<ab> This product is made of two silicone semi-globes which you push together (and pull apart to remove your Death Star), with a hole in the top half through which you fill it with water and other liquid you prefer. We found that if you don't  make sure the two halves were very firmly pushed together, you end up with a ring of ice (think Saturn) around the hemisphere of the cube. Your will find a perfect shape!!