Nardi Steering Wheel - Competition - 330mm (12.99 inches) - Black Perforated Leather with Grey Stitching - Black Spokes - Type A Horn Button - Part # 6070.33.2091_BlackHB. Whats Included: Nardi Certificate of Authenticity, Steering Wheel, Type A Horn Button. Note: The Type A Horn Button is designed to work with most applications where the Classic Horn Button is not compatible (like MOMO to Nardi Conversion Adapters, Short Spacers, etc).