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: 1.8 lbs. Model#: CMBRAVO1KITM. KIT INCLUDES:* CM762145X1 Anode* CM806188X1 Anode* CM821630X1 Anode* CM806190X2 Anode* Fastening Hardware* Installation Instructions CM762145X1 and CM806188X1 anodes included CM821630X1 and CM806190X2 anodes included Fastening hardware; installation instructions | Mercury Anode Kit for Bravo I Engines, 1988-Present - Magnesium