Sports / racing steering wheel by Nardi, maybe the top steering wheel companiy in the world.
The perforated leather is normal-mapped from higher resolution geometry, but texture size kept in good size for memory preservation.
Also available are 3ds and obj versions in the support files section.
Update: the main file is 3DSMAX 2011, using default scanline renderer. In the support files, after purchase, There is a 3DSMAX 2014 version that uses mental ray materials and renderer.