I think they are cut circumfrentually, as in pi-r squared, KISS principle, length wise!  Opps, cake are square, pie are round!  Pi-d!  Wrong formula, right idea, lengthwise cut! 

 so you get long strips, then use a vise grip or channel lock to stretch and wrap!  On the other hand, I haven't had the opportunity to try that method!
Hawkdancer