From FCS

Performance Core (PC) fins are made using a multi-layered resin transfer molding process. The flex pattern in PC fins extends progressively from the base through to the tip, helping the surfer to maintain drive and hold through a turn. This versatile fin material is light, and can be used in a variety of different conditions.

Overview

• Mark Richard's famous twin template produces exceptional drive and speed.
• The small stabilizer (center fin) adds control whilst maintaining the freedom and maneuverability of a twin fin setup.