Golf ball

摘要

A golf ball is composed of a core (1) and a cover (3) covering the core (1). The core (1) is composed of a cross-linked rubber whose Young's modulus lies in the range of 3O Mpa to 100 Mpa both inclusive and whose loss factor lies in the range of 0.01 to 0.45 both inclusive, when the Young's modulus and the loss factor are measured by a split Hopkinson's bar tester whose impact bar has a collision speed of 14.0 m/sec.