I recently purchased 4 keurig signature mugs. The mug is a nice large size and holds 10 - 12 oz of coffee from the keurig maker. The ceramic material used to make these mugs keeps the heat of the coffee hot! I am 100% satisfied  with these mugs; that is, they are aesthetically pleasing, and they are sturdy as well. I now have a set of 4 red mugs, and I will probably purchase another 4. They arrived swiftly ahead of my coffee order.