Ryan, we used three different sizes just like the width of the trim rings were three different sizes, so they would be more proportional to the size of the speaker. This was 304 stainless ordered from McMaster Carr. They size by the number of square openings per inch, and the size of the wire. I started by getting their sample pack, good to have if you want to see size differences in person ( or to show customers). PN of sample is 9231T11. For the large bass speaker we used 5x5 mesh size (5 openings per inch) PN is 85385T31. For mid’s we used 8x8 mesh, PN is 85385T42. For tweeters we used 10x10 mesh, PN is 85385T48.