Partially dried clayware. Leather hard pieces can still be trimmed, fettled and are still flexible enough that pieces which have gone slightly out-of-round, for example, can be squeezed carefully back into shape.
These mugs are in the leather-hard stage. They have just been trimmed. The clay has dried firm enough to handle them without pushing them out of shape too much, but not so much that it is difficult to tool and flute the foot ring.