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The Yoyo King Yoyo Tool is a very useful accessory that makes taking care of your non-responsive yoyo much, much easier. It's small and light, and even works as a keychain.
The big round metal post fits inside a wide or narrow C sized bearing, which has practically become standard for most of the newer high end yoyos. The hex key fits inside of Yoyo King removable axles, so that you can more easily adjust them. And the groove is a string cutter, so you can always make sure your string is just the right length for optimal performance. It's a super handy yoyo tool that belongs with your yoyo collection. Buy it today!