These are an Italian brand of double walled coffee mugs (Thermic glass). They come in a box of two and hold 32 ml which is slightly larger than other brands of glass mugs.
I bought these for $39.95 for two, at David Jones online.
Summary An excellent, well made, and nice looking mug, I would highly recommend these as they keep the coffee warm for longer. They ARE available cheaper online at a few other places, product No. 6510356.
Great idea Finy, but we wouldn't have anywhere to put them. far too big for my mug space I'm afraid, but I'm sure a lot of people will find them useful. I use the same small coffee mug every single day. It was a gift from 1 of my sisters, a few years ago, & fits on the space on my (pod) coffee machine.