Generous concave.
Minimal knurling.
8 allen head traction pins per side (replacements included).
Jim's specific pin position and height.
Recessed Bearing cap (on sealed model).
Heat treated spindles and Aluminum bodies use materials of superior strength over traditional pedals.
Magnesium sealed or looseball (Black).
Aluminum sealed (Black, Red, Blue, Silver) or looseball (Black, Red, Blue, Silver, Limited Edition color) Limited edition colors are just that.