The trống cái or trống đại "great drum" is a traditional Vietnamese bass drum. It has a barrel-shaped wooden body, and gives a deep booming sound. The trong cai drums are typically hung on a stable frame, and in traditional drama the trống đại cổ is beaten to support the singers. It can also be carried and used at the head of a dragon dance procession.
- International Workshop on Nhã Nhạc of Nguyễn Dynasty: Huế court music - Page 115 Huế Monuments Conservation Center, Ủy ban quốc gia Unesco của Việt Nam, Viện nghiên cứu âm nhạc (Vietnam) - 2004 "...Trống cái (big drum)"
- A handbook of the musical instrument collection of the Commercial Museum, Philadelphia 1961- Page 28 , Joseph Barone - 1961 "Dimensions: Height — 20"; Diameter of Heads — 10". t Cai-Trong (Cai tron) — Annam, Indo-China The Cai-Trong of Annam retains many characteristics of Chinese drums. It has a barrel-shaped wooden body, which is brightly lacquered, and ."
- Vietnam pictorial - Issue 546 - Page 36 Thông tấn xã Việt Nam, Vietnam. Bộ văn hóa và thông tin - 1999 "..the "trong cai" or "dai cau" — the bass drum, giving a deep-toned rumbling or booming sound upon percussion."
- Famous ancient dance relives or lives again - 1000 Years Thang Long "If the dragon dance is performed in a procession, the Trong Cai (Big Drums) go first and the dragon dance follows."