Bright. Colourfull. & Tough. Fun, 2-tone Bambroo Mug Set Are Made with Naturally Organic Bamboo & Are Fantastic Reusable Option for Your Daily Brew. Screw-top Lids Are Also Made with Bamboo & Include an Integrated Straw Hole, for Those Who Prefer Cold Drink. Features - Made with Naturally Organic Bamboo - Screw-top Lid - Food Grade Silicon Grip - Dishwasher Safe - Integrated Straw Hole - Drink Clean: Bpa Free Minimum Quantity: 50.