Official size and weight Field training baseballs are made to the official standards of 9 inches in circumference and 2.8 inches in diameter, as well as the official weight. Suitable for training and official game occasions. Durable construction The ball combines a tough rubber core with a hard PVC outer coating to deliver durability and longterm performance for frequent use. This design supports consistent throwing practice and repeated sessions without quick wear. Fingerprint marking system Features a fingerprint marking system that visually displays different grips, including fourstitch fastball, curve ball, slider, and more. Helps beginners understand and perform grip techniques on varied pitches and terrains. Versatile training aid Aims at both righthanded and lefthanded players, with fingerprints that adapt to any grip. Supports skill development and consistent throwing across diverse players and practice scenarios. Practical use scenarios Onfield team practice: Use during drills to practice throwing mechanics and pitch recognition, using the grip visuals to reinforce correct form for multiple pitches. Indoor or limitedspace training: for gym or indoor training where space is restricted, helping players work on grip familiarity and throw consistency without a mound. Coaching and youth sessions: Ideal for beginners and mixedhanded players in clinics or individual lessons, enabling rapid understanding of grips and transfer to realgame throws.