OneDrop Side Effect

we have a Yelets. and it has a hole in the middle. I saw some pics with the center having a flat rivet. is that a side effect accessory? what doe it do? dose it change the play? or just for looks?

Pictures from another store have been removed.
Please no not post pictures from other stores.
They are generally considered their property
And possibly copy righted material
Thanks.

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Those are Lego Side Effects. They will add some center weight compared to the hollow ones

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Side effects allow you to change out the center to change up the weight of the yo-yo. The top one is a Lego side effect, you can actually attach Lego pieces in it. The bottom is the ultralight, their lightest side effect for the least center weight.

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There is a “Side Effects” page on One Drop’s website with a lot of info (not linking directly because it is also a store).

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I’ll share the link, this isn’t against the rules.

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I see. But I am new. I don’t understand what center weight dose. can some one explain? thanks. there is a tick side effect that looks like you can spin it like a top but the rest looks like just different styling to me.