Matt 'Mayhem' Biolos' tri-quad (5 fin) set allows you to customise the performance of your board. Choose the thruster for more control in hollow sections or the quad for more speed and flow when carving on the open face. :: Unisex > Surf Accessories. Fin SpecsIdeal Conditions: A wide range of conditions. particularly good in critical overhead wavesBoard types: Performance shortboards and hybrid modelsFront fins: Base: 4.30\ / 109mmDepth: 4.9\ / 116mmArea: 14.49\ / 9347mm²Sweep: 31.7ºFoil: FlatRear fins: Base: 4.10\ / 104mmDepth: 4.26\ / 108mmArea: 12.64\² / 8158mm²Sweep: 32.4°Foil: 50/50 Size: one size.