Here's the hot info, straight from the Scale Motorsports webpage:

Starting out with Revell's 2005 C6-R kit (complete kit included) Scale Motorsport upgrades an already fabulous builders' kit by adding highly detailed turned aluminum racing rims that replicate those of the 2006 Le Mans class winner. The kit is designed for the intermediate to advanced model builder and supplies further enhancements of highly detailed components such as:

• Turned aluminum components: Set of 4 OZ style racing wheels, 4 hub shafts, 4 nut shafts, 4 brake hubs, 1 oil tank.
• Photoetch details: 1 large fret of photo-etched metal parts with hundreds of extensive details.
• Decals: A 2006 C6-R decal sheet printed by Cartograf to build either the number 64 class winner or its companion racer the number 63 car, and a Scale Motorsport composite fiber decal sheet to further detail enhance key composite components throughout the car.
• Instructions: Extensive instruction booklet that coordinates with the Revell kit instructions.