This 18 oz insulated mixing tumbler is made of a passivated 18/8 stainless steel material (to eliminate metallic taste) and is great for both hot and cold beverages. Without a lid, it has a tapared rim for a great drinking experience. With a lid, your beverage is even further protected from the outdoor temperature and bugs. Contains no BPA, phthalates, lead, or other toxins. Doesn’t retain or impart flavors. Available in matte black or stainless steel.