By it's TEMPTURE
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You need to know the radius/diameter or the height of the drum.
D2x0.785
Hourglass drums are a class of membranophone, or drum, characterized by an hourglass shape. They are also known as waisted drums. Drumheads are attached by laces, which may be squeezed during a performance to alter the pitch. The category also includes pellet drums such as the damaru, although not all pellet drums are hourglass shaped (such as the Korean do, nodo,noedo, and yeongdo, which are barrel shaped).
363 lbs
Its diameter is twice its radius