Dazzling Toys Astonishing Hand Boiler (Green) (D149/G) 1 Dazzling Toys Astonishing Hand Boiler. Our hand boilers use thermodynamics to actually appear to boil. One hand boiler per order. A classic science toy great for learning. Uses the heat from the hand of the user to boil liquid! Each hand boiler measures: 6.25 h x 2 w. It is made of glass. Keep away from little children. Manufactured by Dazzling Toys.