This lube is specifically designed for Non Responsive (unresponsive) yoyos. This means a yoyo which requires a bind to be performed to make the yoyo wake. Typically a large C bearing.
This oil is intended for all NONRESPONSIVE yoyo bearings. The smallest amount of dirt can great affect the quality of spin and possibly make it respond. We always recommend taking the bearing out to lube it. Set it on a paper towel and only add a few drops. Let it sit for a few minutes then pat dry while being careful not to absorb the oil around the balls. This thin lube works for all bearing types, not just bearings which go on Duncan yoyos.
PLEASE NOTE: The lube packages leak during transport so it is not uncommon to open the bag that the lube comes in and find some of the lube has leaked out. There is nothing we can do about this. Please dry the bottle off with a paper towel and store in the upright position.