The bigger the ice cube the slower it melts and the Silicone Ice Sphere Mould can make huge ice cubes! In fact, they are not even cubes at all. This mould makes ice spheres, which are way cooler than your average ice cube. This set includes two food safe silicone ice sphere moulds that are really easy to use. Simply fill them up with water through small holes on the top and pop them in the freezer overnight. The silicone construction ensures that the ice balls are easy to remove once frozen.