Moongel is a translucent blue, sticky, gel-like substance produced by the drum practice products company RTOM. It has been incorporated into several products.

Moongel Damper Pads come in packs of four and are applied to a drumhead

Drumhead

A drumhead is a membrane stretched over one or both of the open ends of a drum. The drumhead is struck with sticks, mallets, or hands so that it vibrates and the sound resonates through the drum.-History:...

 or cymbal

Cymbal

Cymbals are a common percussion instrument. Cymbals consist of thin, normally round plates of various alloys; see cymbal making for a discussion of their manufacture. The greater majority of cymbals are of indefinite pitch, although small disc-shaped cymbals based on ancient designs sound a...

 to diminish the higher overtones.

Moongel Workout Pads are practice pads which are available in 7" and 14" diameter sizes. Unlike most practice pads, they allow no free rebounds which guarantees them to accelerate muscle development.

Moongel dampening has become a popular studio technique. Due to its dampening properties, it allows for drummers to get a "punchier" sound of out their toms

Tom-tom drum

A tom-tom drum is a cylindrical drum with no snare.Although "tom-tom" is the British term for a child's toy drum, the name came originally from the Anglo-Indian and Sinhala; the tom-tom itself comes from Asian or Native American cultures...

.