Pre-stretched for longer lasting playability, Isospeed V18 is a comfortable co-poly that does not skimp on control or spin potential. This string's unique comfort comes in part from additives designed to boost elasticity. The result is a control string that is more responsive on slower strokes and touch shots. Finally, this string's ultra-thin gauge is ideal for grabbing and rotating the ball. Topspin players looking for comfort should give this string a serious look.