Special indoor fountains give off virtually no smoke, no odour and very little heat and do not eject burning particles like outdoor fireworks do. These indoor fountains are often called ice fountains due to their lack of hot sparks. They are easily the most effective indoor pyrotechnic effect available to the consumer. Sold as card tubes about 4 inches long and often with a plastic spike to stick into a cake they are easy to light and give a bright plume of sparks a foot or so high for around a minute. Most used on Birthday cakes or even a center piece for psrties etc. They can also be taped to champagne bottles !