WASABI PRO HYBRID features two co-poly tennis strings; one designed for the main strings and one designed for the cross strings. The main string (WASABI) is a square shaped co-poly string designed for maximum spin and control. The cross string (WASABI X features a round profile coated with a slick surface. The slick surface allows the main strings to slide out of position, grip the ball and then snap back to generate massive spin. Wasabi Neon Pink - Main String (1.23MM - Square Shaped) Wasabi X Neon Blue - Cross String (1.23MM - Round)