As the firmest and most control oriented member of Luxilon's string family Luxilon 4G will keep your biggest, most powerful shots inside the lines. To extend the playability duration, Luxilon spent two years tweaking the molecular properties of this string. Big hitters looking for maximum durability and control will should give this one a serious look. The fact that is has better tension maintenance and playability duration than the average co-poly makes this one hard to beat.