Reel Butter® Oil is a high-performance synthetic oil developed by Ardent specifically for fishing reel components. Ardent Reel Butter® Oil is a 100% Full Synthetic product with specially engineered additives to provide superior, long-lasting lubrication for any model fishing reel. Applying Reel Butter® Oil to ball bearings, spool shafts, and other wear points in your favorite reel on a regular basis will ensure a smoother, quieter, and high-performance experience.