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: 1.7 lbs. Model#: CMSXKITM. KIT INCLUDES:* CM3855411X1 Anode* CM3854130X1 Anode* Fastening Hardware* Installation Instructions CM3855411X1 and CM3854130X1 anodes included Fastening hardware; installation instructions | Volvo Penta Anode Kit for SX Engines - Magnesium