Dura Ace 7600 track hubs are either single sided fixed or double sided fixed. They do not make a freewheel version: http://www.google.co.uk/products?q=dura+ace+7600+hub&um=1&ie=UTF-8&ei=PORFTK2hE4WUjAfNxYi2Bw&sa=X&oi=product_result_group&ct=title&resnum=3&ved=0CD4QrQQwAg So unless they are not DA 7600 hubs, they are fixed with a SS screw on. the seller may have bought the wheels and does not understand. However, I am right.
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Dura Ace 7600 track hubs are either single sided fixed or double sided fixed.
They do not make a freewheel version:
http://www.google.co.uk/products?q=dura+ace+7600+hub&um=1&ie=UTF-8&ei=PORFTK2hE4WUjAfNxYi2Bw&sa=X&oi=product_result_group&ct=title&resnum=3&ved=0CD4QrQQwAg
So unless they are not DA 7600 hubs, they are fixed with a SS screw on.
the seller may have bought the wheels and does not understand.
However, I am right.