Compatibility: The 0.31in diameter straw is designed to fit Stanley, Simple Modern, Meoky, owala 40 oz tumbler, easily meets a variety of drinking needs. 18/8 Stainless Steel: Made from 18/8 stainless steel and free of BPA, ensuring safe use. The 0.31mm wall thickness offers added strength and durability. The fine polishing and smooth, rounded edges prevent any discomfort. Bonus: Equipped with a silicone tips that is soft and comfortable and protects your teeth and lips from damage. The straw cover can effectively prevent dust and impurities from entering the cup, keeping your drink clean and fresh. Easy to Clean: Equipped with a special straw brush to make manual cleaning easier. Also dishwasher safe Rest Assured Ordering: If you are not satisfied with the purchased product for any reason, please contact us