Good guess. Cellidor is a legacy plastic, looks good but is not resistant to several common chemicals, like deet, found in insect repellent, which causes crazing. Nylon would be much better for a variety of reasons, but the SAK became iconic with the original scales, so Vic keeps on keeping on. Can't blame them for that. Where the irony comes in is that they sell basically the same SAKs for less with the superior nylon scales. For example, the Sportsman II, or Eco, in some markets, is the nylon scaled version, sold as a bargain alternative to the prettier original. I have one that I bought some years ago at a closeout sale for $7. The Swiss cross shows wear, somewhat, but no big deal. Look for others in that line, save some $, and have a superior version.