Tilong Canon is created by Ji Ji from Zun village, Yongji county, Shanxi province in the late Ming dynasty followed by Qing dynasty. It's geared to reinforce the exercise of the vital energy and mental faculties, will and power. The boxing integrates itself internally and externally, combines the void and the solid, integrates hardness with softness, unites the form and spirit. It's a way to keep health as well as practice boxing.This product is manufactured on demand using DVD-R recordable media. Amazon.com's standard return policy will apply.