This Martyr Anodes CMVERADO4KITA Mercury Aluminum Anode Kit is perfect for use in salt and brackish water with Verado 4/ Optimax Engines. The kit includes anodes and is made of high-quality aluminum material. Please note that this product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. This kit is compatible with a wide range of outboard engines and is a must-have for any boater looking to protect their engine from corrosion.