Unlike solid colors, shiny t-molding such as chrome (silver) and gold are only a surface treatement. This means it can be worn off over time. I'm not exactly sure how thick it is, though. That probably depends on the maker.
If you're curious to know what it looks like you can order *free* samples at:
http://www.t-molding.comI have some samples silver and gold if I can find it. I'll tell you about it if I can find it. Otherwise you can order your own.
By the way, I noticed crazy prices for the stuff on Ebay. Like $5 for a roll. Don't know when the auctions end, but look for both "chrome" and "silver" because both terms are used.