More specifically, Yonex designs and positions the racquets to be its spin franchise ... including the trademark Isometric head shape, Liner Tech, Aero Fins and Vibration Dampening Mesh.

but it wasn’t until the shift to graphite frames in the early ’80s that Yonex really made its mark. The R-22 was the first tennis racquet with an isometric head shape, increasing the size of ...