PROTECK PERFORM FCS THRUSTER 4.5 BLACK Performance Fins have a rigid core that creates good drive and projection off bottom turns and cutbacks. The combination of the flexible edges and rigid core will help to make your board ride smoother, faster, and easier to turn. This will allow you to surf better, reduce fin injuries, and add more fun to the sport of surfing! Performance Fins with the rigid core are recommended for intermediate to professional surfers. Pro Teck Fins are surfboard fins with flexible leading and trailing edges designed to enhance board performance and reduce fin cuts. The flexible trailing edge allows the water to flow smoother with less turbulence off the fin. The flexible edge also creates a \