Slit gong
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A Slit gong, sometimes also called "slit drum", is a type of idiophone. They are sometimes referred to as a type of drum, but they are not drums at all. Drums are membranophones whereas a slit gong is an idiophone.
In most instruments, the wood on the two sides of the slit is of different thicknes, resulting in tones of different pitch. They can therefore be used to imitate the tonal patterns found in tonal languages. Instruments with two slits (like the ones shown on the picture) can thus have up to four different pitches.