Standard Perfection Pitching Training Baseballs - Official standard size and weight: These baseballs are manufactured to match the official standard size and official standard weight. They have a circumference of approximately 9 inches, a diameter of 2.8 inches, and a reasonable weight for versatile training and real-scenario practice. - Durable construction: Built with a tough rubber core and a resilient PVC outer shell to provide lasting durability and reliable performance through frequent, long-term use. - Speed learning and grip guidance: A unique color-coded fingerprint system visually demonstrates grip positions for fastballs, curveballs, sliders, and more, helping you learn the correct grip quickly. - Universal suitability: Designed for all players, suitable for left- and right-handed use, with easy-to-grip fingerprints that support any grip. - Use scenarios - Solo practice at home or in the gym to improve grip consistency and throwing technique using the color-coded cues. - Team practice or bullpen sessions to reinforce grip and release through repeated drills with real-game applicability. - Beginners and intermediate players learning grips for multiple pitches (fastball, curveball, slider) using guided fingerprint positions for rapid skill development.