K-POP features two co-poly tennis strings; WASABI and CAVIAR. This unique blend was designed in collaboration with pro player Karue Sell from Karue Sell HQ. The main string, WASABI, is a square shaped co-poly string designed for maximum spin and control. The cross string, CAVIAR, is a hexagonal co-poly string that has exceptional stability and maximum precision. Compared to K-PRO, K-POP is slightly softer and more elastic, which translates to more feel and ball-pocketing. 1 package includes 2 half sets (6.7M length per half set) for 1 racket String Guru Notes - Compared to K-PRO, K-POP is slightly softer and more elastic, which translates to more feel and ball-pocketing. Stiffness Level: Firm