Make spherical ice cubes with this do-it-yourself kit, containing four silicone moulds. The benefit of adding round ice to your drink? Spheres melt slower than cubes, which means less water dilution and more flavour in your drink. To use, simply close together the two halves of the silicone mould, pour cold water in through the hole at the top and place in freezer for at least 2 hours. Each has a flat base so they stand easily in the freezer. Once frozen, peel apart the silicone moulds to reveal your ice sphere.