Fire Treated Acoustic Fabric - SoundAssured Dual Layer Acoustical Fabric (100% Acoustic Transparency)

no worries

This did not turn out to be what I thought it would be. I should have looked more closely at the time I made the purchase.

Good match for old Advent

Fabric is good quality. Fire retardant is important, should always be used for speakers. Looks very much like the cloth used by Advent in the 70s.