My bet is IF they changed resins, you wouldn't be able to tell the difference.I happen to have 2 sets that I bought brand new. One was 2 years ago and the other was in 1997. I bought the new set because the old one has gotten to where they seem to get smudges on them too frequently and it's hard to keep them looking clean and shiny. I like shiny. Otherwise, they look, weigh and measure identically throughout both sets. My bet is nothing changed.