34 oz thermoserv foam insulated coffee mugs - black gama electronics a good coffee mug is like a comfortable pair of jeans or your favorite boots - it just feels right. the 34oz mug was the large size that was available at most gas stations and convenience stores. a few years ago they suddenly disappeared from the market and haven't been seen since. well, we found the mold and arranged for a special production run of mugs. these mugs are produced under the patent #3684123. they are double wall insulated and unlike other mugs on the market, they are foam filled so they are far superior at keeping drinks hot or cold. these rugged mugs are both dishwasher and microwave safe. the lid snaps on tight and doesn't leak out the sides like most of the chinese imports! this listing is for one black mug with a black top. there is no printing or graphics on this mug.