I don't know who makes the replacements parts for these shavers but, the quality control leaves much to be desired. This replacement head is not nearly as good as the original. Not by a long shot. It's not as sharp as the old one (which I thought needed replacing) and, it rattles and buzzes like crazy. I'm afraid it will fall apart, or worse, damage my shaver.
I'm glad I kept the old one. Even after a year of use, the original is still sharper, smoother and much more quiet than the replacement.
Even at $37.00 (which is a good deal), these replacement heads aren't cheap and, one should expect better quality.