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PITCH TRAINING BASEBALL
• Learn to throw four different pitches: 4-seam fastball, 2-seam fastball, curveball and slider
• Finger placement markers show proper grip for each pitch
• Can be used by right and left handed pitchers
• Color coded pitching key printed on baseball
• Official size and weight baseball
投手訓練球
•學習投擲四種不同的投法：4縫快速球，2縫快速球，曲線球和滑球
•手指放置標記，顯示每種投法的正確握姿
•左、右手投手皆可使用
•棒球上印有彩色編碼的投球鍵
•符合官方尺寸和重量的訓練棒球
使用方式請參考下列影片說明：
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