Zinc: For use in salt water
Aluminum: For use in brackish water
Magnesium: For use in fresh water
| Brand | Martyr Anodes |
| _Case | 20 |
| _Case | 20 |
| _Description | Horseshoe Shape |
| _Description | Horseshoe Shape |
| _Material | Aluminum |
| _Material | Aluminum |
| Shipping Details | |
| Weight: | 0.70 lb |
| Length: | 5.7 in |
| Height: | 1.0 in |
| Width: | 4.1 in |