PAIR! Advent Larger Anti Diffraction Pads Egg Tweeter. Pair Anti Diffraction dome Tweeter Ring speaker grills for Advent Larger loudspeakers. 5x5 square with 2.5" diamter hole Felt wool, laser cut, per pair Cleans up high frequency response removing distortions caused by screws, baffle edges, etc
 
These are for the later model, flush mount, NLA fried egg tweeter.