Standard size: This training baseball follows official sizing standards for training and games. Each ball has a circumference of 9 inches, a diameter of 2.8 inches, and a weight that meets official requirements. Enhanced durability: Built with a tough rubber core and a resilient PVC outer shell to ensure lasting performance through extensive training sessions. Speed learning: A color-coded fingerprint system visually teaches gripping for fast balls, curve balls, sliders and more, supporting faster skill development. Multifunctional training: Suitable for left-handed or right-handed players; the easy-to-grip fingerprints adapt to each grip, helping players at all levels improve accuracy and control. Use scenarios: - Beginners use the color-guided grips during practice throws to learn proper grip and release. - Pitchers train multiple pitches (fastball, curve, slider) with visual grip cues to refine technique. - Teams or individuals work on consistency with both hands, using the fingerprint grips to standardize grips across players.