I got these super cheap yoyo string from amazon and they came with these “replacement cords”
I dont know what these are or what’s the use of it, it would be appreciated if someone can tell the use of this:)
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You say “cords”, are you referring to the 2 little black o-rings? I believe those are specific to Henry’s YoYo’s. I can see directions on the backside of the packaging but you won’t need them unless of course you have that throw.
Or…. Are you referring to the green things, the string? 
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no the cords
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You mean the yo-yo string? If it’s not the black o rings I’m not sure we know what you’re talking about
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Are you unsure how to put the “cords” on the yoyo. I think you are confused as these are the strings that you purchased. What kind of yoyo do you have? What are the entire contents of what you received?
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a normal yoyo. I was just wondering what is the use of the black o ring thingy
and on the back of the package this is shown
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Although I do not have a yoyo that uses these, it seems as if they are some sort of spacer that would go in between the bearing and the body of the yoyo. They also look similar to these o rings for hubstacks:
Again, I am not certain, but I hope this might point you in the right direction 
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Thanks a lot:)
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Yup. Those are for a specific yoyo made by Henry’s. No required for yours.
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Thanks a lot too mate
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Those are replacement o rings for the old Henry’s transaxles. They probably also fit newer hubstack yo-yos so might be good to keep them as spare parts.
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