could be the knurling..as my cw freestyle bars are 'knurled' well
![Huh ???](http://www.radbmx.co.uk/forum/Smileys/smilies/huh.gif)
(all across where the stem would clamp the bars)
but my cw pro bars are 'half knurled' (on the outside but not in the middle )
![Huh ???](http://www.radbmx.co.uk/forum/Smileys/smilies/huh.gif)
would have been better if they were stamped cw though you'd think.....that would be to easy though
![Cheesy :D](http://www.radbmx.co.uk/forum/Smileys/smilies/cheesy.gif)