Mjölnir (Norse Mythology)

Mjolnir aka Thor's hammer is famous, and made by Brokk and Eitri. According to the story of Loki's first prank, the brothers hadn't put the correct size for the handle. It had power though even if it looked like a small baby rattle.
# It wouldn't shatter; it was perfected to be STRONG
# It wouldn't get so dirty; it was Titanium-made
# It would return to Thor.
It was used in MANY adventures of Thor included things.