在古塔胶球和橡胶中空球时期，球杆杆面的设计变得至关重要。
During the gutta and rubber core domination the golf club face design was to become important .
一种发白的橡胶，来自古塔树的凝乳胶。
A whitish rubber derived from the coagulated milky latex of the gutta-percha tree .
古塔胶