The product is a lot of 2 Uni Filter RF-1 Fuel Oil Filters with Gear Tooth, designed for use in various furnace models such as 1A-25A, 77 XF-25, 8055 F-300, A-77, and S-254. Manufactured by General Filter in the United States, these replacement furnace filters are essential for maintaining the efficiency and longevity of your heating system. The gear tooth feature helps to prevent filter bypass, ensuring that your furnace operates at optimal performance.