Adore Bliss SS Tumblers and Straws are manufactured from 304 (18 8) Food Grade Stainless Steel, adding to it is the ergonomic design which perfectly complements the tumbler by firmly enhancing the grip and the airtight lid which are spill proof by making it easy to carry on the go and having a mess-free experience This set has an extra closed lid which helps to carry any liquids when the straw is not in use. The straw cleaning brush makes it an easy way to clean the straws without hassle. These tumblers are manufactured using world-class, state-of-the-art machinery.