如刀鋒般簡潔俐落，速度就是我得分的關鍵。
寬度 Width: 39
重量 Weight: 67.42
顏色 Color: Gold & Red
刀是悠九第一顆量產的溜溜球，他搭配了悠九獨家的軸心對正系統，還有悠九才有的回收系統。外型以最簡單的蝶翼型加以進化，簡單、有效率。做招滑順，適合速度招。除此之外，只有第一批限量一百顆是搭配悠九獨家的陶瓷弧形軸承一起販售。
Dao is the first manufacturing yo-yo from Yonity. It include the exclusive axle system and the exclusive response system. The shape is basic on the wing. It is simple and effective. You can do any trick with Dao smoothly. Besides, only the first batch of one hundred Dao sold with the ceramic bearing in a pack!
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