Polycarbonate ThrusterA balanced all round fin. Generally used in our softboard series but can also be used as in standard boards for beginners or simply a back up set of fins. Sold in pack of 3 fins. Construction: Polycarbonate (PU) Ideal Waves: All types but best in beach breaks. Thruster: Predictable Control used in the majority of boards ideal in smaller conditions. Small: Height 109mm X Base 108mm Medium: Height 120mm X Base 112mm Large: Height 120mm X Base 112mm