Hub centric wheels

[dkpriebe]

I recently discovered that my wheels are not hub centric. Yesterday I was
having my tires balanced, and asked the shop about getting adapters to make
them hub centric. They didn't have the correct size in stock, so I didn't
get them. One thing that surprised me is that the adapters are plastic. I
had assumed that the adapters would be an alloy, aluminium or some metal.
Does this sound correct?

Thanks,
Dave Priebe
Kenmore, WA
91 200tqa 157k his
95.5 S6 100k hers