BE AMAZING TOYS-Geyser Tube Science Kit. Make a 25 foot Soda Geyser using included Mentos Mints and your choice of diet soda (not included). This kit contains one test tube: 6x1 inch, one package of Mentos Mints and instructions. Recommended for ages 8 and up. WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 years. Imported.