3.75 Quad Rear Height: 3.75 in – 9.5 cm Base: 3.64 in – 9.2 cm Area: 10.9 in² – 70.32 cm² Foil: Symmetrical Tang: 1/2" & 3/4" tangs An all-around great rear for a quad Available Materials: RTM material - red yellow green or blue. These are only the REAR fins and are recommended for use with the following front fin models: VII QF4, VII Q1,VII QFEA,VQFT1 Note: Quad Rears are available in 1/2 inch only for this Model only. Quads have either 1/2" or 3/4" depth. If the rear boxes are shallower than the fronts and are marked with an "X" then they are 1/2". If the front and rear boxes have the same depth and are marked with an "F" then they are 3/4". You will need to know this during checkout when you purchase these rear quads.