- Official size standard: Approximately 9 inches in circumference and 2.8 inches in diameter, designed to meet official size standards to suit training needs and official game scenarios. - Superior performance: Rubber and PVC construction provides durability and reliable performance for long-term, frequent use. - Efficient learning: Colorful fingerprint marking system helps you quickly understand grips for different pitches, including fastball with four stitching, fastball with two stitching, curveball, slider, and more. Ideal for beginners seeking efficient learning. - Multipurpose innovation: Suitable for both left- and right-handed players; fingerprints adapt to each grip, making it a versatile tool to enhance skills. - Use scenarios: - Warm-up bullpen sessions to practice grip and pitch variety. - Individual training at home or on field to reinforce grip and pitch recognition. - Team drills to teach grip identification and improve consistency across players.