So I strung up my AG100 with 17g TF Black Code Mains at 56 lbs and VS Gut 16g crosses at 60 lbs - I like my crosses tighter to hold the mains in place, especially since the AG100 has a lot of string movement, IMO. So this setup had about 10 hours on it - and the gut was still looking to be in great shape. A little bit of fraying here and there but not too bad. Then last night during some heavy hitting, *SNAP*. I look down at my strings to find that the Black Code had broken, not the gut. Kind of surprising to me. So I check out the strings more when I get home to find that not only was the gut FAR from being ready to break anywhere, but that in about a dozen places, it had notched DEEP into the Black Code, and it looked like the Black Code was about ready to break in 5 different places. Now I know that generally speaking, 17g strings are going to break sooner than 16g, but the gut looked like it was heavily sawing through the Black Code - this kinda surprised me, even despite the fact that Black Code is on the softer side, for being a poly. My only thought as to why this occurred is perhaps because I like to straighten out my mains a lot whenever they move and get crooked. Does it seem possible to anyone reading this that that could be the case? Sliding the mains across the crosses to straighten them out causing major sawing through them? I've put a lot of different hybrids in my racquets before, and have never experienced the poly mains breaking before the crosses, and especially have never had poly break before gut in a hybrid. I was actually a little disappointed that the poly mains broke because the gut crosses still looked to have quite a bit of life left in them.