Though quite firm and durable Luxilon 4G is loaded with playability. Our testers found this one to have higher than average comfort for a monofilament string, making it more than just a niche string for string breakers. Luxilon spent two years tweaking the molecular properties of 4G in order to extend the life of playability. This is a great option for players who want all the benefits of a control string without the high tension loss that comes with some of the first generation polys.