The raw cups are hand-turned in porcelain, Bone China. They are glazed inside and on the edge, the grooved surface is rough / unglazed.
The grooves also get a good grip on the simple shapes.
Espresso: 75 ml.
The raw cups are also available in other sizes:
Cappuccino: 150 ml.
Coffee: 200 ml.
Latte: 300 ml.
The Raw series is dishwasher and microwave safe.