Aside from its paper body and the Lazurite Fly, the Orizuru crane has a carbon tube skeleton, 3D printed nylon motors, a radio receiver and a battery that lasts up to five minutes per charge. The whole package weighs a mere 31g, or about an ounce. Here’s a short feature from Japanista:
Here’s more from Rohm…
…and from Engadget:
Head to Engadget for photos of the Orizuru’s components.