[情報] 日本descente投球訓練gyro stick
http://blog.yam.com/czBaseball/article/22502825
這個器材拿來做投球動作的練習相當不錯
用法和甩毛巾的毛巾是一樣的
但他會用聲音提醒你手臂的加速喔!!
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還是一樣
我沒有賣 要買可以去拜託OOOOO辦理 XD
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http://blog.yam.com/czBaseball
crash's cabinet / crash的球具櫃
棒球球具部落格
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