Warranty for S and S- fins lasts 12 months. For S– fins, the warranty is 6 months.
Due to big tolerances in board production, we are producing the fin head 1/10mm bigger than the fin box. This means, that the first time you are using your fin, you might need to sand the fin head until it fits correctly into the box. If you sand it too little and start tightening the screws, you might break the fin head, and this is not covered by the 1y or 6m warranty.