Wax resist and celadon glazed. Handthrown off the hump with a foot attached seperately. Each cup has a makers mark on the base. 
 
For reference the eggs are hens eggs not bantam. Opening for the egg to sit in is 4cm in  diameter. Number 6, 7, 9 have a 4.5cm opening.
 
Handmade in Norfolk, in small batches in my garden studio. Work is bisque and then glaze fired to stoneware (1240 degrees C) in an electric kiln - powered by renewables (including solar) .
 
Packaging is plastic free