BENDER GONGS
Jin Ban gong: Also known as a bending up gong or Chinese opera gong, this one bends up sharply in tone when struck.
Available in 7" to 9" sizes.
Tiger or Bending Down Gong: A signature sound of China, the Tiger ranges from about 13" to 16" and has a distinctive downward bend to the note when struck sharply in the middle.
https://dreamcymbals.com/products/gongs/bender-gongs