Wind chimes or Aeolian chimes, wich may be used to observe changes in wind directions, .are often hollow or solid metal, glass, or wooden tubes which are usually hung outside of a building and are intended to be played by the wind, which causes the chimes to strike each other or metal, wood, or rubber balls which may be hung in the centre.

Fascinating precision-tuned chimes are real musical instruments that will last a lifetime are thought to be good luck in parts of Asia and are used in Feng Shui. In Japan they produce pleasant ringing sounds and are hung by the windows during hot humid summers in order to bring cooling relief.

Chimes are also made of materials other than metal or wood and in shapes other than tubes or rods. Many people accept bamboo, stones, horseshoes, mechanics tools, PVC pipe, glass, seashells, old silverware, etc., as chimes. Every material makes a different sound.  whether you are using a solid cylinder or a tube, and if a tube, the wall thickness.