This is a bottle of Hudy One-Way Bearing Oil. This high-quality HUDY One-Way Bearing Oil is used to lubricate one-way bearings for ultra-smooth operation and long lifespan. Super thin to help promote quick penetration and fast & easy coverage. One drop will cure a slipping one-way immediately! Recommended for nitro & electric touring cars, before each race or practice day. A "must have" item for serious racers.