ive been using a lot of polys all these times.. but wat surprises me is that all these times whenever i use polys on my string (most of the time babolat polymono ballistic).. ive never broken it.. i did a hybrid once with poly main and syn cross and i ended up busting the syn gut first.. everytime i use full poly job.. it ends up that the polys lost like 10 lbs before i even get a chance to break it.. ive played div 1 tennis and when i tried my serves in the speed gun (aus open) i did reach 210km/h.. in the game my 1st serve would probably avg around 180-185 km/h.. so i dont think im a slow hitter either.. so is it just me or poly just doesn't break?