My guess is under the silver is simply a black plastic. That's how silver trim in most cars is done, and on heavily used items, sometimes the silver gets rubbed away showing the black behind.
Hopefully you don't have that problem, but considering the price, I wouldn't be surprised that over time, the silver will wear off. Regardless, that's a good price even if they don't last for the life of a car and I may consider getting a set for myself.
Hatch Nation #13 : Rally Revolution #13 : ROTM Jan '13
It's Bryan, not Brian
RSVT-170 Build in Progress
Rusty is dead