Bentley Ruby 20 oz. Tumblers, Set of 4. All Bentley Drinkware and Tableware products are manufactured in Perryville, Arkansas. All products are BPA-free. Their products are made from a durable SAN plastic that stands up well to everyday wear and tear. Products are dishwasher safe and will not crack or haze. It is not advised to use any Bentley Drinkware or Tableware products in microwave. The glasses are tip-resistant and the 20-oz. is perfectly sized for kids or adults.