I wanted to replace my worn out Ear Cups for DT 770 PRO 32ohm, and I plan to change the material by purchasing the Velour option.
It's good that I searched the forums first and saw that the material is a very important factor in the sound.
After I consulted with Beyerdynamic through their website, I decided on these Ear Cups since only they will not change the sound I am used to, because they were original for these 32ohm headphones.
There are other factors besides the material that affect the sound, such as the number and size of the holes on the back of Ear Cups.
I learned a lot during this purchase.
The only thing that is a little unpleasant is the rather difficult installation of the new Ear Cups. Sony for example has a much simpler replacement patent.
Nevertheless, I am very satisfied.