I have 8 acoustic panels for sale as a set. I will not separate them. 2 are GIK acoustics bass traps. The other 4 are ATS acoustics panels with two being thicker and 4 used for first reflection points. They are varied in color. I will entertain serious buyers only. These worked wonders for my Hi-fi system, however, I've transitioned to a headphone system since I now live in an apartment.