SPF BASEBALL SP-MSP60 Wrapping Rod Shadow Pitching Training Tool 60cm 250g Opened, but in excellent condition after a few uses. Thank you for your consideration. The following is an excerpt from the manufacturer's website description: ● Purpose (1) Mastering the flex after the acceleration phase: Made of soft, flexible resin, the tip comes out late, so you can unconsciously experience the "flex." You can learn to use your arm like a whip. By simulating a long arm with a complex pitching motion, it further stimulates the nerves and encourages the brain to think. This allows you to naturally learn the timing of arm pronation (internal rotation + internal rotation/supination). Also, by focusing on the tip, you can understand the importance of creating a left-side wall for a right-handed pitcher to throw strongly. ● Purpose (2) Acquiring the axis of rotational movement: By aiming to accelerate the tip, you naturally need to take a deep follow-through, and you can naturally take a follow-through that wraps your arm around your core. ● Purpose (3) Expanding the range of motion of the gluteus maximus and hip joints: By combining slopes and platforms, you can experience a deep follow-through. At that time, the weight of the tip stimulates the muscles on the back of the buttocks when swinging, providing a stretching effect. You can obtain the range of motion of the lower body to secure a large trajectory. ● Purpose (4) Measurement is possible and objective efforts are possible: Management by numbers is possible with a simple measuring device. The player's motivation increases by objectively viewing their own arm swing. It is possible to secretly practice with numbers at home. Shadow practice for form confirmation turns into practice with a goal. ◆ For players who are still growing in height and physique, it can be held shorter or cut according to their stage of development. ◆ Recently, the use cases have been increasing as a practice tool for young players' tee batting, one-handed batting, indoor practice during rainy and winter seasons, and safe practice.