ZyMax-62 The lightest string ever made; 25% lighter than standard .70 mm strings. Optimum repulsion with crisp sound players want to hear! ZyMax-70 The lightest string ever made; 25% lighter than standard .70 mm strings. Optimum repulsion with crisp sound players want to hear! ZyMax-67 Lowest tension loss of any badminton string. Exceptional tension stability insures an excellent combination of durability and repulsion at all stringing tensions.