Designed to process swing velocity and adjust its properties in real time. The string thinks with you so you can concentrate on the essentials. The fiber properties of the polymer material change based on swing speed, stiffen on fast strokes for more control, and bend on slower strokes for more grip. Designed specifically for lower string tensions, LXN Smart offers polyester-like performance with the soft feel of a multifilament material. This side gives you incredible security in any situation.