For everything that rolls! Only one drop needed for each applicationAllows ball bearings to roll freely and evenlyEliminates skidding and sliding of the ballsConditions and lubricates the surface of the ballsMaintains a clean, smooth ball bearing surface, free from dirt, sand, salt, and grimePackaged in a unique pinpoint dispenser for clean and easy application OneDrop Ball Bearing Conditioner and Lubricant is designed to be used on traveler cars and other ball bearing applications to improve performance by reducing rolling friction. OneDrop Ball Bearing Conditioner is the only product that Harken recommends for use on ball bearing travelers and battcars.OneDrop Ball Bearing Conditioner and Lubricant is specifically formulated for things that roll: ball and roller bearings in blocks, traveler cars, and Harken Battcars. Use it in very small amounts (one drop in each bearing race) and youll see a significant reduction in friction under load.0.5oz.