My EX1000 looked so awful after yrs of heavy use with hardly any regular cleaning. The stock foam materials were so oily and dirty and worn out to a point it started affecting the audio. So I decided to pulled out all the foam materials . First I listened without anything put back in and it wasn't bad. Then I tried filling with some foams and it lost bass. But when I tried filling both housing with the stuff shown in the pic below, it sounds wonderful. I saved this little box when I bought a fountain pen nib from a vendor.