Julian's thruster set features a neutral side fin template with a smaller centre fin. This makes it ideal for performing short arc turns and fast futuristic surfing on and above the lip. "My set comes with a smaller fin in the back I find this helps me release off the top a lot easier" - Julian Wilson :: Unisex > Surf Accessories. Set of threeSweep: 31.0Foil: 50/50Centre Fin Specs: Base: 4.29\ / 109mmOptimum Weight Range: 65 - 80Kg (Size Medium)Side Fin Specs: Base: 4.40\ / 112mmDepth: 4.55\ / 116mmBoard types: Performance boards with shallow concave and moderate-to-low rockerArea: 15.17\² / 9785 mm²Suitable Conditions: Hollow steep waves. punchy beach breaksSweep: 33.3Depth: 4.50\ / 114mmArea: 14.06\² / 9070 mm²Foil: Flat" Size: one size.