Patent ID: 8651985

Claim:
A racket frame comprising a head, a shaft, and a pair of throats extending from the head to the shaft, wherein a flexural rigidity G 15 of the throats in a low load range (from 5 kgf to 15 kgf) is equal to or greater than 600 kgf/mm but equal to or less than 900 kgf/mm, a flexural rigidity G 55 of the throats in a high load range (from 45 kgf to 55 kgf) is equal to or greater than 900 kgf/mm but equal to or less than 1200 kgf/mm, and a rigidity ratio (G 15 /G 55 ) of the flexural rigidity G 15 and the flexural rigidity G 55 is equal to or greater than 0.70 but equal to or less than 0.85.