The slenthem (also slentem or gender panembung) is an Indonesian metallophone which makes up part of a Javanese gamelan orchestra.

These keys are suspended by leather cords over individual bamboo tube resonators in a wooden frame, which are cut so that the placement of the bamboo's node causes the functional length of the resonator to be shorter for higher notes.

The instrument is played by striking the keys with a mallet, called a tabuh, which has a short handle and a thin wooden disk edged in cloth or rubber.

[2] It is a low-pitched instrument[3] with a softer sound than the saron demung.

[4] Like the saron barung and demung, it generally plays the most basic form of the melody (balungan) in a composition.