(BEIJING, Feb. 28) – On February 28, in Beijing's Wangfujing area, jigsaw puzzle pins of the "Bird's Nest" went on sale. This is a precious opportunity for Olympic pin collectors.

On Thursday morning, China's first center of Olympic pins opened in Beijing. The center has a collection of pins showing the Olympic symbols of 144 National Olympic Committees (NOCs).

As one of the most eye-catching Olympic products, the newly issued "Bird's Nest" jigsaw puzzle pins include 12 pins that piece together to form the full image of the "Bird's Nest." Each pin can also be worn independently. And all of them are made of silver-colored steel, which is the major material for the construction of the "Bird's Nest." So far, six pins out of 12 have been issued.