The racquet specs say only to use one piece. I was wondering if anyone has tried and successfully strung it using two piece (for a hybrid). I've been stringing it one piece with NRG2 (16) at 60 lbs but it only lasts on average two weeks before a main snaps. I'm pretty meticulous when it comes to stringing, making sure I don't burn or notch the mains when weaving and pulling the crosses, so I don't think the strings are breaking prematurely. I've also tried several multi's (x-one biphase, NXT, Attraction, Xcel Premium, Sensation) with similar results. I think I could extend the life of the strings without suffering much playability if I could string the M-Speed Pro No. 1 with poly mains and multi crosses. I'm just not willing to destroy one of my racquets attempting to string it with two pieces if I don't have to.