Change the color than the photos taken from the site that is equal to the photos received by certain holders Super Umi in the microphone industry. There seems to be of the filaments or gray cotton ...... Problem or paranoia?
The 'photos' on the site are not photos but computer generated pictures. That textile covers the speaker to prevent dust to get onto its membrane. On the other side the steel mesh covers nothing, there's no speaker on that side.
I don't see the issue ? Does it really matter what colour the speaker protection mesh is ? It's such a small detail that makes little aesthetic difference to the overall phone.