Future Fins Stretch Quad RTM Stretch Quad Foil: Stretch's Inside Foil Front Fins: Stretch Quad Height: 4.39 in - 11.2 cm Base: 4.34 in - 11 cm Area: 14.52 in 93.68 cm Recommended Rears: 400 Quad Rear Height: 4.00 in - 10.2 cm Base: 3.89 in - 9.9 cm Area: 12.41 in-80.06 cm Base Depth: 1/2 in. This Fin only comes in 1/2 inch base. Available Materials: RTM (resin transfer molded)