Leaders attending the Group of Seven summit in Hiroshima over the weekend were given replica paper crane mementos designed in memory of a girl who died from radiation-induced leukemia 10 years after the 1945 atomic bombing of the city, a source close to the matter said Monday.

The souvenirs are based on a paper crane that sat beside Sadako Sasaki's deathbed. She died from her illness at the age of 12.

Weighing 1 gram, they are made of stainless steel and are engraved with the words "G7 Hiroshima." They were produced using cutting-edge technology that replicates the folds and wrinkles of the original origami crane.