The trial balloon for the PTS drums was launched by Rogers when I was a district sales manager in the organization. They were known as the R 340 drums. I think that we took back as many sets of these drums as we sold. They just would not hold together. The flimsy latches that took the place of lugs would self-destruct. Some of the acousticon shells caved in. The R 340 series was a short-lived disaster while the 80's versions of the R 360 and R 380 were very successful. Remo took over marketing their acousticon drums for themselves. Some of their later upscale drums were pretty good.I can't find a picture of the brochure for those ill-fated R 340 drums. But, I did run across one picture of a set.