I think these are made by Paterson. I still have a big box of the clips, so I probably won't need any more in this lifetime - but I would be pissed if a replacement set came with little plastic bumps. And I see only one clip in the set is weighted. I hope IC has forwarded this thread to the Pooh-Bahs at Patterson.
I agree these are (or, were) the best clips around. I also have some old stainless steel Kodak and FR clips that pierce the film, but they use a bent up 'arrow' of metal for the piercing, which is not nearly as effective. The FR variant is preferable as the hanging hook design lets them be clipped and unclipped from the line.