A piece cost P300 only. The capacity is 400 ml, with a heat retention of 6 hours. They are made of stainless steel with polypropylene cover.
I checked also the other brands, such as Emsa, Tiger, and Zojirushi with heat retention of 24 hours.. Better, all right; but, they cost more than a thousand bucks
For my purpose, the Omega tumblers can do the job. This is where I measure and store the 200 ml hot water for a few moments before pouring over the coffee grounds.