Cadmium free, environmentally friendly.Aluminum: For salt and brackish water. Conform to: Mil-Spec A-24779(SH) Magnesium: For freshwater only. Conform to: Mil-Spec A-21412(SH)MERCURY VERADO 6 ANODE KIT (SEACHOICE)SKU: 7.1925E+11$42.99PriceQuantity*Add to CartFeaturesIncludes: Block anode for gimbal housing (5) Skeg for ventilation plate (1) Plates for side of lower unit (2) 18-8/304 Stainless steel screws Fits6 CylinderMaterialAluminumCase10