The Core is the center-most component in a golf ball's construction. Broadly speaking, the aim in designing a golf ball core is to return a tremendous amount of energy when a force is applied to it. The core is the engine of the golf ball. It is made primarily from Polybutadiene, a synthetic polymer rubber material. Polybutadiene is resilient, meaning that it recovers quickly when a stress is applied to it, such as an impact with a golf club.