These projectiles, designed for automated pitching devices, are typically constructed from synthetic materials like dimpled polyvinyl chloride (PVC) or a composite core with a synthetic leather cover. They vary in size and weight depending on the intended use, ranging from lightweight options for youth training to regulation-weight spheres for advanced practice. The characteristic dimpled surface of many of these projectiles influences their aerodynamic behavior, enabling more consistent flight paths.
The availability of durable, machine-compatible projectiles is essential for effective baseball and softball training. They allow for repetitive practice, facilitating the development of proper hitting mechanics and timing without the need for a live pitcher. This accessibility has democratized practice opportunities, enabling individual athletes to hone their skills independently. The development of specialized practice projectiles reflects a broader trend towards increasingly sophisticated training equipment in sports.