Aluminium Anode kit made by Tecnoseal, one of the worlds leading suppliers of sacrificial anodes for cathodic protection in the leisure boat market.
The kit for the Volvo Penta 290 sterndrive comprises of the saildrive ring and bar anodes along with the required fixings.
Aluminium anodes are suitable for salt aqnd brackish water situations and are recommended by many outdrive manufacturers, please check your manufacturers recommendations