Our steam powered boat is made of Tin. When a small heat source such as a candle is placed under the boiler, the boat takes off moving through the water. Once the candle is over, use a wick and oil in the candle holder and play again. Easy to store and carry with the boat measuring 5.5" in length. The toy comes with a tin boat, candle holder with wax and filler. This pack contains 5 boats.This toy will truly amaze and help kids self discover the science behind it's working.This classic toy comes from 'Desi Toys'