2 easy to remember hints/indicators when choosing sacrificial anodes for your boat Two easy to remember hints/indicators when choosing sacrificial anodes for your boat:1. The surface of the anode is related to the metal surface it protects.2. The weight/thickness of the anode is related to the anode’s longevity.It is one thing to seek to buy a high-quality anode cheaper, but it is NOT OK to go cheap with the anodes.When using anodes, SIZE does matter.You can always contact us at gvapo@nauticalarmor.com