Final Touch 'Colossal' Ice Cube Whiskey GlassEnjoy whiskey on the rocks with this uniquely shaped glass with a silicone mould that makes one extra large 1. 75 (4. 5 cm) cube. The rounded bowl of the glass helps to focus aromas while the shape of the squared glass base helps keep the ice cube centred for even chilling. The extra large ice cube melts much slower than traditional cubes, resulting in longer lasting flavours and less dilution.