It is called the core.
It is COR not Core. Coefficient Of Restitution.
the person who invented the core inside the baseball that makes the ball go fast was Frank C. Cerrone.
The core of a baseball is made up of a round-shaped rubber or cork center. This core is surrounded by layers of yarn or wool that are tightly wound to create the ball's shape. Finally, it is covered with leather that is stitched together to complete the baseball.
They named it softball because the game of softball was derived from Baseball. The baseball had a hard core whereas the softball has a soft core, so they named it softball. Although the ball is not softball the core of the ball is soft.
MLB (and most others) uses a rubber bouncy-ball like core.
rubber
The Core of the sun
Generally the core of the ball is cork, rubber, or a mixture of the two.
They named it softball because the game of softball was derived from baseball. The baseball had a hard core whereas the softball has a soft core, so they named it softball. Although the ball is not softball the core of the ball is soft.
The baseball is made from a round cushioned cork pill at the core,and Polly cotton windings as laces in midsection,and the cow hide covering exterior
Baseball bats can be made of ash, maple, aluminum, or sometimes a foam core with a rubber grip.