Name: kepyak (Wikipedia)  an instrument used in gamelan 
A type of idiophone. 

Wikidata item: Q8015183
External links: 

http://worldhitz4u.blogspot.com/2013/12/kepyak-indonesia-musical-instrument.html

Disambiguation: An idiophone made up of many bronze/iron plates attached by strings or a single plate
Description: The dalang (puppeteer) plays with a mallet held in between the toes of their right foot. It is placed on the side of the keprak (wooden box) and can also be played directly with a mallet (cempala) by a foot/hand. 

Uses:

• Dance performances
• Wayang
• Signals end/beginning of pieces in gamelan