Alphas are excellent, excellent bumper plates. Had them for about 3 years now, and just bought a few more 10lb and 25 lb plates. The plates are fantastic. I have used them outside on asphault and concrete, plates are still as good and as strong as when i first bought them. You know how those cheaper, black, standard cross-fit gym plates evenutally have hte inner metal collar come loose? That's not happening. Not even close to a hint of that happeneing. One gripe is that as of 3 years ago, the colors were pretty muted (and harder to see the difference without a close, well-lit look), but on these most recent purchase (1 month ago, March '24) the colors were more vibrant and in a higher ratio to black than before.