The unique aeolian chimes marketed today have calculated cylinder distances and length and width. This is usually in sync with the specifications within the science of Feng Shui.
Authentic replicas of the ones specified in Feng Shui are made along the application of formulas that enable the maker to decide on the calculated length to achieve a particular note.
Unlike in the case of an organ pipe, where the pitch is determined by the length of the air column that vibrates, in the case of wind chimes, the pipe material itself is struck and hence, the timbre has little to do with the air column. The music may change with every change in the direction of the wind.
Now, there are well-known and loved hymns inspiring the placement of the cylinders and material, in the manufacturing of wind chimes. The sails and clappers are constructed with delicate laminated bamboo that not only adds to the durability factor, but also is tunable to the required musical note.
There are dedicated percussion wind chimes in the market that are tuned via a computerized process to produce soothing sounds. The intonation and the frequencies at which the different tubes vibrate are integrated. These are popular around the world.