Metal Call of Cthulhu Dice Set: - Rules of Play says:
Q WORKSHOP together with Chaosium Inc. produly present this unique metal dice set for Call of Cthulhu Roleplaying Game. These dice can also be used with any game where you need to fight the monsters from Outer Sapces. Watch out for the tentacles, they're everywhere...
The set contains 7 polyhedral dice. The dice are made of tin, engraved and painted in black.