Guess it....

This one is my favorite thing. This is a set. First, the body made from wood. It's cylinder. The edge of this thing is made of metal. In the middle of this thing is made from hard leather. The body usually has a color like red,black,purple,and so on. It has different size, and usually in one set has 4 main composition. In the bottom of this things set, has a pedal to make this thing produce the sounds. the second is from the set, it has part made from nugget. The size also different. These set are hard. And to produce sounds from this set we must use a stick made from wood. the sticks are not very bid, and not very small. And we must sit to be more comfortable to use this things. We used to see it in television, concert, and art festival. What is it???