How is that cup balancing? It looks like it has no flat bottom.[/quote]
It is a bit deceiving , but it does have a flat bottom and they are very stable , I don't no what they are called but they are kind of insulated ( I think there is a layer of air inside the glass ) , anyway very good at keeping the coffee hot and your hand cool while hanging onto it .
Here is another pic I took at the same time as that first one , it doesn't show the glass , but this is a coffe and Syderco thread. .
PS- Merry Christmas .