I'm a longtime Duncan fan but have recently started using other brands of yo-yos, including the magic yo-yo. The bearings come without an end shield (which I prefer). Bearings have a long rotation time. I have fitted one into the magic yoyos I have and into my Duncan Roadrunner with great results, the bearing fits and works perfectly with the Duncan Roadrunner. Has yet to be tested in their yo-yo-yo-yo factories. The tool is easy to use. Overall this is a great product. I recommend using thick cords on some wider gap yoyos as the bearings are not really responsive and can make a wider gap yoyo difficult to tie. Ps yo-yos connect perfectly with bearings
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