Lot of 4 espresso cups and 4 sub cups in Japanese "Raku" style

Lot of 4 cups and 4 sub cups in Japanese "Raku" style. Enamelled sandstone exterior, glazed speckled interior. Set little or no used, in excellent condition (as new). The specificity of the sandstone makes each piece unique, this very solid material resists hot, cold and small accidental shocks -- height cup 6.5 cm / diameter 5 cm -- under cup diameter 8 cm.