These are probably the same as the precut dampeners that came with Drop Dan Clark Aeon Open X. I'd probably get this for my HD700 if I didn't already get the mod for it. The only problem I have with these is they should've included the dimensions (I could not find the info anywhere on this page) or at least put something in the included pictures as a frame of reference to know how big these really are. It would be really nice if one could make multiple cut-outs from these.