These bricks are relatively new to the market place. The difference being that they are manufactured with tile quality clay and have the coloured enamel finished baked on. They are the same size as a standard brick, being approx. 230x110x76mm.
The nature of the brick and due to the manufacturing process, careful planning is required when ordering them. In this regards, you need to know how many faces of a particular brick you need to have the finish applied. You may need to specify you require 1 face only, 1 face/1 end, 1 face/2 ends, etc. Hence the cost and the need to be very specific and well organised.