Special Edition is an item attribute for Wheels in Rocket League. Special Edition Wheels can be one of four types: Infinite, Holographic, Inverted, or Remixed. Some Special Edition Wheels also include animations.
Here are some examples of each Special Edition type:
Infinite: Adds an infinite depth with a mirror-like effect
DRN Wheels (Forest Green)
Holographic: Adds a transparent or translucent effect
Galvan Wheels (Pink)
Inverted: Changes design elements to matte black
Dimonix Wheels (Purple)
Remixed: A different take on the same general design
Polaris Wheels (Titanium White)