Check out this video for a comprehensive explanation of Li-Ning rackets!!! https://www.facebook.com/video.php?v=1006327346060915 You will require a facebook account to view the video. A youtube video should be up shortly!
Here is the youtube link for those who don't have facebook: http://youtu.be/msoAM6uVkPA?list=UUsstOJ9Bcnv4KhM5jUaJ2Rw