I was browsing in Radio Shack the other day and I spotted an odd looking pair of Koss's I'd never seen before. I believe the model was 'Koss R/70-b' .. There were strange first of all because they came with a detachable microphone but who really cares about that. The interesting thing is that they are open, circumaural phones.. They had nice big metal grills in back.. The other thing is that there was no foam or anything covering the drivers.. I took a close look and they are most certainly the portapro drivers, as the driver looks identical, and the rated impedance is 60 ohms. Other than the cheezy foam ear pads, these could be good phones. Anyone ever seen / heard these things before? I haven't been able to find any reference to these on the net anywhere.