This set of 12 Power Bolt Official PB-1 baseballs is perfect for training purposes. The balls are made of high-quality rubber material with a cork core, ensuring durability and performance. The white color of the balls makes them visible even in low-light conditions, and the fastpitch ball type is suitable for softball games. The set comes with a bag for easy storage and transport, and is an official league product. The balls are non-domestic, but the size is one size fits all. Whether you're a seasoned player or just starting out, these balls are a great addition to your gear.