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The shell of the drum, or the place you pound to create noise, is stretched over a circular opening on both ends of the barrel of the drum. The tension is the factor that determines the noise produced.
different drums are mad of different things. For a drumset, most of the drums are made out of various woods (birch, maple) depending on the sound you want but sometimes they are made out of acrylic...
The top of the drum, also called the head, is where the drummer hits the drum. Originally, it was made out of animal skin, but now they're almost exclusively made of some sort of plastic, usually one...
If you're talking about tradditional African drums, they are made out of wood and animal skin. Which is why the skin of the drum can sometimes have animal prints on it! Sometimes these drums also...