Videos Surfboards How to Install Your New FCSII Fins Back to blog FCSII Fin System Set to become the new world standard in system technology and performance, FCSII is designed to accommodate all surfers; regardless of their age demographic, surfing genre, or the boards and waves they're riding. We have a MASSIVE range of FCSII here at boardshop so check it out! We also have the FCSII Infill Kit, The FCS II Tab Infill Kit. FCS II Compatibility Infills are designed to plug the gap between the front tab of the original (twin tab) FCS fin and the front of the new FCS II plug front slot. Boardshop Review the FCSII Fin System! Back to blog