hubstack o-rings

on yye shop section, i went to accessories and looked at yyf hubstack tech. there, i found a lot of selections, but what i needed is the normal hubstacks. i know they come with no bearings, that is ok for me, i already have them, but do they come with the little rubber o-ring?

What yoyo are you putting the stacks on?

888 does it matter

Yes it matters, and yes it comes with the O-Rings. Just look in the picture:

I would kind of look at his favorites, my guess would be an 888.