Configuration and Attachment: 3-fin set (Thruster) with a dual-tab base, designed specifically for FCS-style fin boxes. Dimensions and Weight: Size Large (4.65 inches / 11.8 cm height), recommended for surfers weighing over 80 kg. Material: Honeycomb core and epoxy resin construction, ensuring lightness, responsiveness, and controlled flex. Profile (Foil): Flat inner side, ideal for providing a direct and predictable response.