The product is a 3-pack of 9.2" x 3/4" NPT RV water heater magnesium anode rods, designed for use in water heaters to prevent corrosion and improve efficiency. Made of high-quality magnesium material, these anode rods are durable and effective in protecting your water heater. With a diameter of 12 inches and dimensions of 8.35 x 3.74 x 0.91 inches, these rods are suitable for various water heater models and are manufactured in the United States by a trusted brand. Regular installation of these anode rods will help extend the lifespan of your water heater and ensure optimal performance.