This Baseball icon is made in Material Design style developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 4,300 icons, all in the same style and quality.
It's an image of a baseball and bat. The bat is a tube with one end being thicker than the other, gradually becoming thinner from halfway down. On the bottom of the thin end is a oval representing a handle. Next to the bat is a circular ball with lines through it.