Wilson - 6.1 Stretch vs 6.1 si Stretch

WilPro

Semi-Pro
I'd like to know what is the difference if there is any.

As far as I can understand they both are 28 inch racquets.
 

Zoolander

Hall of Fame
Dont think there is any difference. The s.i was wilsons swing index rating they used for a while. Was just a label.
 

stickM

New User
I have a couple of each of the frames labeled 6.1 Stretch and 6.1 si Stretch. I can't tell any difference in them other than graphics and my si's have white butt caps while non-si's have black ones. I think I read in a thread on the 6.1's that the ones labeled with si were only a different model year graphics... and maybe a different location that they were made also.
 
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