Train your children's observation capability thinking and analytical skills. Develop children's scientific interest let children observe the energy conversion process understand the principle of steam engine. Manufacturered by CHoppyWAVE. Features: DIY Educational Kids Toy Size: 15cm x 8cm/5.91" x 3.15" (Approx.) Package Includes: 1 x Boat Toy 1 x Glass Bottle 1 x Bottle Cap 1 x Bottle Cap Bayonet 1 x Wire Rack 1 x Bottom Base 1 x Straw 1 x Candle Exercise your children practical ability.