Looking at Lowes and HD sites, I'd say mine were Everbilt or Hillman brand. Although they all look similar in that style and when I but them they are in bulk bins or tubes, preferably on sale. I'd say you're right about the UV difference too. You might try to by new ones, and put a coat of good orange paint on them from the start to protect form UV longer. I space mine out as far as I can, just enough for me to follow the contour of the long drive, and only put them on one side. I thin plow pushing snow to the opposite side every time so the stakes don't get much abuse. Honestly, I figured I'd be replacing a few each year and they would have all been replaced with new by now, but I haven't damaged any yet. The reflective tape is definitely wearing out though.