Cathodic protection is an essential thing especially for Steel hull boats in order to withstand or avoid corrosion. Zinc or Al.Anodes are manufactured in different shapes and weights and can be fitted to the Hull . So Cathodic protection by means is a "must" for the protection of all metal parts under water. So, not only for steel, but also for wooden fibreglass, anodes are required. Zinc anodes are made to the highest possible standard, specifications.