Before you decide which zincs you use to protect your boat, compare the quality of Zimar® Zincs and the competition: Zimar Zinc Anodes are made of 99.99% zinc, compared to 99.9% Zimar Zinc Anodes last longer than traditional competitor zincs. Zimar Zinc Anodes are individually made to assure the highest possible zinc concentration and lowest amount of porosity. But don't take our word for it. Compare the two images, and decide which one you want protecting your boat. There is a reason most discerning boat/yacht owners use Zimar® Zincs to protect their vessel, experience the Zimar® difference.