AMAZING ice trays! Even more so because they are made in Greece! The curve at the bottom is a very clever differentiation from the "cubic" ice trays that makes it incredibly easy to detach all the ice cubes with just one move! If they also designed a curved surface on the sides, then they would be unbeatable compared to the competition because, in addition to even easier detachment, the volume for each ice cube would be slightly larger, making them comparable to the competition. I have bought many for Athens and for my vacation home, where I empty 5-6 ice trays into a large container, so I constantly have an abundance of easily accessible ice cubes.