defected bearing?

hey guys, i bought a bearing and it has a strip through the middle! and my loop of string keeps getting stuck in there. is this supposed to be there? if so what is it used for?
help please

Is it a Crucial Grooved Bearing? If so, then yes, that groove is supposed to be there. It centers the string in the same way a beefcaked yo-yo will.

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Beef and cake don’t taste good together. Put in a yoyo and you get an ugly mess.

that my friend is what i would call preferance. though, beefcakes make me feel weird.

that is my brother mastershade