FCS B5 BONZER PG CLEAR 4 FIN SETFCS B5 BONZER PG CLEAR 4 FIN SET Overview B5 Bonzer quad setup (4 fins) developed by the Campbell Brothers. The Campbell Brothers developed these bonzer side fin templates to work with the concaves of the board, control water flow, and achieve maximum speed, acceleration and hold. Board Types All board types. Will fit the FCS II Fin System when used with grub screws and the FCS Infill Kit. Performance Glass Performance Glass (PG) fins are machine cut