YYF Performance Oil (Long Spin). For smooth play and long sleepers, this oil will help keep your bearings spinning for a long time to come. This oil is intended for bind-response bearings. Just the tiniest bit of dirt in the bearing can have a huge impact on performance or cause the bearing to make a strange sound when it spins. When that happens, just take a drop of this oil to the bearing and watch your problems melt away. This bit of maintenance will help preserve your bearing's lifespan as well. For those of us who have lost new bearings to a bit of dirt, there's no need to convince us of the value of this oil. Compared to a dry bearing, this oil will shorten your long sleeper slightly, but the difference is barely noticeable. Please be sure you are using this oil with "Bind Response" model yo-yo's only.