Heidelberg Christmas City Incense Cones. Each box contains 24 pieces. Contains a mixtures of the scents: gingerbread, pine, cinnamon, vanilla and Christmas myrrh. Manufactured in Germany by Knox. Each piece is approximately 1.1 inches tall (2.8cm) and would be appropriate for most medium and large smokers. Manufacturers Packaging: Display Box. Knox has been manufacturing incense cones since 1865.