Stainless steel 304/food grade PP, 350ml/12oz Coarse,25g-35g Double-walled, vacuum-insulated S/S outside 201 + inside SUS304 Can keep drinks hot or cold for hours Unique filter system more efficiently brew coffee on the go. No over-extraction. Isolate water and sediment First, it is a vacuum flask, can keep your coffee warm or cool for hours Secondly, it can make coffee, similar with the french press but no any residue as the french press always do. Because of the extra fine mesh filter. Thirdly, with our patented self lock system, it can lock the brewed coffee and will not let it drop down to the coffee ground, even you drink it hours later, will not affect the taste. Vacuum flask plus coffee maker, what you do is just to fill in the coffee, press the plunger, then ready to go. So easy and convenient. Suitable for many occasions.