A wake surf fin to replace your center OEM fin if you've lost the original or just need to change the fin size for a different feel behind the boat. Fins change out quickly and easily with a fin key (sold separately). Features Includes 1 Liquid Force 3" Wake Surf Fin Fins Measure: 3" H x 3.8" L Symmetrical Shape Designed For Center Specific Fin Placement ***These fins will Only mount to FCS/bottom mount surf boards.