Introducing the Duralex Stacking Tumblers – a Fusion of Practicality & Durability. Crafted From Fully Toughened Glass, These Tumblers Boast Strengthened Resilience Against Impact Damage Throughout. the Added Stacking Lug Enhances Convenience, Making Storage a Breeze. In the Rare Event of Breakage, the Toughened Glass Fractures into Harmless Fragments, Mitigating the Risk of Serious Injuries. Ideal for Establishments Adhering to License Regulations or Aiming to Minimize Glass-Related Incidents, Our Stacking Tumblers Provide a Safe & Reliable Solution. Elevate Your Drinkware Choice with the Assurance of Safety & Longevity, Courtesy of Duralex. Minimum Quantities Apply.