<P> In 1910, the cork - core ball was introduced . They outlasted rubber core baseballs; and for the first few years they were used, balls were hit farther and faster than rubber core balls . It eventually went back to normal . Pitchers adapted with the use of the spitball, which is now illegal, and an emphasis on changing the ball . </P> <P> In 1920, a couple of important changes were made to baseballs . They began to be made using machine winders and a higher grade of yarn from Australia . Although there was no evidence that these balls impacted the game, offensive statistics rose throughout the 1920s, and both players and fans believed that the new balls helped batters hit the ball farther . </P> <P> In 1925, Milton Reach patented his "cushion cork" center . It was a cork core surrounded by black rubber, then another layer of red rubber . </P> <P> In 1934, The National League and American League came to a compromise and standardized the baseball . They agreed on a cushion cork center; two wrappings of yarn; a special rubber cement coating; two more wrappings of yarn; and, finally, a horsehide cover . </P>

What kind of baseball does the mlb use