This is a butt box compatible with Gamakatsu's grouper rods (Grand Impulse, Gamakue Impulse, Dora, etc.). Manufacturer: FMW Material: Super duralumin ■About the Material Made of super duralumin, a lightweight, high-strength material also used in aircraft. Its specific gravity is only 2.8g/cm3, less than half that of stainless steel (7.93g/cm3), making it lightweight. Furthermore, its tensile strength is approximately 570N/mm2, which is higher than stainless steel's approximately 520N/mm2. Each piece is produced by cutting from the material, so the cost is inevitably high, but the absence of welding points reduces the risk of breakage. → #Other FMW products are here [Sea Bream, Longtooth Grouper, Grouper fishing, Bottom fishing, Piton, Ishizuki BOX, Rod holder]