Tianji Blue TB6 is a Double Happiness DHS table tennis racket.

Shanghai Double Happiness Co., Ltd. is a world-renowned sports equipment supplier and a leader in China's table tennis equipment industry. Its products mainly include table tennis, badminton, and weightlifting equipment, and have expanded to the three major ball games. , sports protective gear, sports shoes and clothing, small fitness equipment, various field equipment and other sports supplies. The "Double Happiness" trademark was founded in 1959 and was the first Chinese sports brand to appear in a world competition (the 26th Beijing World Table Tennis Championships in 1961).