Tin is the material that our steam-powered boat is made of. The boat starts moving through the water when a small heat source, such as a torch, is put under the boiler. After the candle has burned out, replace it with a wick and oil in the candle holder and try again. With a length of 5.5", the boat is easy to store and transport. The set includes a tin boat, a wax candle holder, and filler. There are 5 boats in this pack. This toy can astonish kids while also allowing them to learn about the science behind how it works. 'Desi Toys' is the maker of this iconic doll.