Specification: Made of stainless steel 304, keeping beverages hot or cold, preserving flavors and freshness. Armed with a filter mesh, you can brew your tea directly in it. Easily remove the twist off lid and filter element to clean. Nanovessel fits most automobile cup, holders. Most importantly, Nanovessel is 100% compatible with Nanopores. Save time pouring hot water from vacuum flask into Nanopresso water tank. You can use the Nanovessel as water tank mounted onto the Nanopores – Making it the perfect addition! NOTE: When mounted onto the Nanopores, the Nanovessel can't ensure its isothermal function. Hot water must be stored in the Nanovessel with its lid fastened for best keep hot performances. Nanovessel should not be plugged on the Nanopores more than the necessary time needed to extract a cup of coffee (1-2 min maximum). What's in the box Nanovessel flask