FCS Mark Richards MR-TFX Performance Core Twin + Stabiliser FinsMR's twin + stabilizer template. Exceptional pivot off the top, while center fin adds control. Overview Mark Richard's famous twin template produces exceptional drive and speed. The small stabiliser (center fin) adds control whilst maintaining the freedom and manoeuvrability of a twin fin set up. Board Types Designed to fit the FCS I Fin System. Recommended for all board types including fish, funboard and twin fin boards.