Small fins for riversurfing or for kids and light girls in the sea The Buster 3.9" Thruster Fin Set fits very light surfers, female surfers and groms for surfing or practicing spintricks on standing waves for all weight classes. FeaturesSlightly harder fins Compatible with the FCS I system (FCS X2, FCS Fusion, SANE Plugs)Finboxes in FCS II system with additional grub screws
