Different companies use different things for the center but at the bottom of the page from this link shows you the most common ball types. http://www.Golf.vonabercron.com/knowledge.htm just scroll down till you find the four types of golf balls. They each have different insides.
It depends on the rubber band ball, some people use a tennis ball or ping pong balls to start it off. Or as i have done people make it entirely out of rubber bands and use rubber bands to start it off. i have a rubber band ball around the size of a football, it is completely made of rubber bands.
Most golf ball are made of plastic inside and rubber outside.
A Golf Ball
It is a golf ball that has the logo of a resort/golf course printed on the ball.
you are suppose to stand about 6 inches back from the center of your body.
That would be a golf ball.
A golf ball.
There used to be a ball called the Titleist Tour Balata, it was a very soft golf ball, the core was a highly pressurized rubber ball with some oil in the center. This ball was last sold around 2000. The cores are now solid.
a Golf ball
Any distance golf ball should be more durable and less expensive then most other types of golf balls. They are made with two layers and are hallow in the center which makes them less expensive and yet durable.