Hung Ga Kuen solid steel rings are Most commonly used for Hung Ga Kuen, these plating process steel rings help to teach the practitioner to keep their hands properly linked in attacks and defense. Also Helps to toughen the Forearms. These weighted steel kung fu rings have been used for centuries in many Chinese martial arts to strengthen fighters, as well as fine tune their forms. Pipe diameter: 18mm. Size small (inner diameter 75 mm & 500g), medium (inner diameter 85mm & 600g), large: inner diameter (95mm & 650g).