Martyr anodes provide low-cost marine protection for boats, marine structures, and boat equipment. Magnesium "Fresh" anodes are specifically designed for use in freshwater environments. Martyr marine anodes are made of a specialized alloy based on the U.S. Mil Spec using only high-purity metals. Weight: 1.2 lbs. Model#: CM290KITM. KIT INCLUDES:* CMV18X1 Anode* CM852835X1 Anode* Fastening Hardware* Installation Instructions CMV18X1 and CM852835X1 anodes included Fastening hardware; installation instructions | Volvo Penta Anode Kit for 290 HP Engines - Magnesium