YoYoFactory introduces the break through Hub Stack technology allowing you to literally grab your yo-yo while spinning and hold it in your hand.

Yo-Yos that can be equipped with hub stacks include G5, 888, SuperStar, and Plastic Grind Machine (note: only one version of the Plastic Grind Machine is equippable).

These are replacement hub stacks for yo-yo without bearings. Just the attachment is included here.