Hand boiler is a fun, mesmerizing novelty. As your hand heats the glass, the gas expands and displaces the liquid, creating a boiling effect - amazing science in action! Product ships in a variety of fun styles! Product: 1.75 x 6.75 x 1.75 inches. Packaging: 9.25 x 7.5 x 7 inches (closed) in a retail display box. BUY 12, RECEIVE A COMPLIMENTARY DISPLAY BOX.