Always check propeller clearance after installing new trim tab anodes. Aluminum for salt and brackish water, magnesium for fresh water, zinc for salt water.
| Brand | Martyr Anodes |
| Case | 20 , 20 , 20 |
| Description | SX-A/ DPS Transom Shield , SX-A/ DPS Transom Shield , SX-A/ DPS Transom Shield |
| Material | Zinc , Zinc , Zinc |