1. Strictly official standard: Our pitch training baseballs are meticulously designed to meet the official size and weight specifications, with a circumference of approximately 9 inches and a diameter of 2.8 inches, making them ideal for all official game scenarios and diverse training needs. 2. reliability: Enhance your pitching skills with this quality training baseball, featuring a rubber core and a durable PVC outer shell. Engineered for performance and durability during intense training and frequent use, this baseball is an essential tool for any aspiring pitcher. 3. Accelerated mastery: Transform your pitching technique with our innovative fingerprint marking system. Easily identify the proper grip for fastballs, curveballs, sliders, and more, accelerating the learning process. 4. Multipurpose innovation: This pitching training baseball caters to all players, whether lefthanded or righthanded. The fingerprint design adapts to each player's grip, serving as a versatile tool to elevate your skills.