Thanks, Serg. They are 200mph+ racing rims made of forged 6061 T6 centers, 6061 T6 spun rim halves, [FONT=Verdana, Arial, Helvetica, sans-serif] stainless steel[/FONT] aircraft-grade fasteners, and feature a painted or chromed finish with a polished or chromed lip.
For about an extra $100 per wheel, I can also use Titanium fasteners, and Jet nuts - they are a Military–Spec Aerospace lightweight nuts made from alloy-steel hardened to 160,000 psi strength specs and then cadmium plated and moly coated.
Combined, these fasteners can reduce weight by up to 2 pounds per wheel.