FCS MR-TX Natural Glass Flex Twin Fin Set Plus Trailer - Clear FCS MR-TX Twin Fin: Side Base: 5.06 in. (128 mm), Side Depth: 5.56 in. (142 mm) FCS MR-TX Twin Fin: Surface Area: 21.05 in. (13580 mm), Sweep: 33 FCS MR-TX Stabilizer Fin Size: Base: 3.55 in. (90 mm), Depth: 3.66 in. (93 mm) FCS MR-TX Stabilizer Fin Size: Surface Area: 9.61 in. (6200 mm), Sweep: 31