all of the strings except a center string 28 of the main strings are somewhat arcuate with all strings to the right of the center string 28 as shown in fig2 having their right sides convex and their left sides concave all strings to the left of the center string 28 have their left sides convex and their right sides concave the terms right and left as regards the main strings 30 are used as applied to the position of the racquet when it is shown in fig1 the cross strings 40 are themselves always in parallelism the cross strings 40 extend substantially at a right angle to the center string 28 therefore at a right angle to an elongation of the string opening 26 which latter is elongated from its inner end to its outer end as best seen in fig2 the mains 30 are disposed in two groups a first group being seen at 42 and being disposed on one side of the crosses 40 and the other group being seen at 44 and being disposed on the other side of the crosses 40 so that one set of the mains 42 will strike a ball on a forehand swing while the other set of mains 44 will for example strike a ball on a backhand swing.