ULTIMATE CALLUS TREATMENT: Calluses are important, but too much buildup is the enemy. With SandBar, you can keep on top of the rough, hard skin buildup. Sand down calluses regularly then apply SandBar Salve to help heal your skin. FUNCTIONAL FOR EVERYDAY: SandBar was created with hard working people in mind - No matter what you are using your hands for! We found the best materials and molded this durable tool for hands everywhere. TRAIN LONGER AND STRONGER: SandBar ensures that with proper and regular use, your hands will be smooth and ready for you to keep on training without bloody and painful torn skin that decreases performance.