yyf SPEC bearing?

What is the SPEC bearing for? (I’m new to yoyoing)

For your yoyo.

It’s a C-sized bearing that is full width for the size, as opposed to a half-spec size(half the width). it’s a very common sized bearing. It can be used in pretty much any yoyo that uses a C-sized bearing.

That’s just what they call their regular C size bearing. There is also the half-SPEC bearing which comes with with the YYF One and that’s a thin C size bearing to make the gap smaller and the yoyo more responsive

It’s a bearing. It makes your yoyo spin.
Personally, I think its an OK bearing, but I would go with the YYJ Speed bearing over the SPEC.

It is a very good bearing that you should get if you need one.

Love YYJ Speed Bearings IMO for me its better than the OD 10 ball

They come free with a $9 yoyo.