These are nice sealed bearing track hubs from Dia Compe.  They are threaded fix/fix with 120 mm spacing in the rear and are available with a 32 or 36 hole drilling in black or silver. They are a far step above the other cheaper Taiwanese sealed bearing track hubs in both quality and aesthetics, but at only a little higher price.

Available in black, white, pink, gold, green, red, blue and silver in a 32 hole drilling.