Lightweight hexagonal-core thruster fins are designed to maintain the flex characteristics of a glass fin with optimum strength to weight ratio. The custom fin base shape means no infills are required when using with FCSII Fin Boxes. Large fins are more raked and carve well with hold. Medium fins are more upright with less tip area, creating minimal drag for more speed and release. Materials Features Lightweight Hexcel Core for optimized flex weight and strength Medium or large size thruster setup with center fin Durable fiberglass sandwich construction with a balanced template No infills required when using with FCSII Fin Boxes Sold separately - not included with surfboards Tech features