Kempul is a set of smaller gongs hung in a rack. Each gongs are pitched. to their own unique pitch

WIkidata link: Q6387169
External links:

• sman7malang.sch.id/index.php/ecomapping/karawitan/320-kempul (indonesian reference)
• https://www2.bc.edu/vincci-pong/kempulGong.html
• www.seasite.niu.edu/indonesian/budaya_bangsa/Gamelan/Javanese_Gamelan./kempul.htm
• https://omeka1.grinnell.edu/MusicalInstruments/items/show/106

Image:

Source: http://collections.nmmusd.org/Gamelan/9916/9916and9917gongsfrontview.jpg

Description: smaller gongs that used to divide between 'nong' sound from kenong. This instrument is played using two heavy wooden stick beaters known as tabuh