Design Engineering 050350 Boom Mat Speaker Baffles, 4" x 6" Oval (Pack of 2) Closed-cell polyethylene enhances frequency response for improved sound clarity Easy conformability in tight spaces for a professional installation Thin material design offers less bulk for a clean and tight installation for professional finished appearance Reduces panel-to-frame and door panel reverberation and road noise for improved acoustics Acts as a protective guard for exposed speakers and extends their lifespan