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If you're looking for a quad rear set that will generate speed and allow for plenty of maneuverability, look no further than the Futures QD2 4.15 Blackstix 3.0 Quad Rear Fin Set.
Blackstix Construction – Blackstix construction has a flexible Carbon Fiber tip that loads up and releases energy for generating speed when you need it. These are the lightest fins in the Futures line.
Rear Fins – Height: 4.15" / Base: 4.16" / Area: 12.60" / Foil: 80/20
80/20 Foil – The 80/20 Foil is a balance between a flat and symmetrical foil. This allows you to get vertical on the face of the wave and hold you through a drawn out bottom turn.
Ride Number 8.1/10 – Ride Number is all about how your equipment feels while you're surfing. Now you can choose a Speed Generating Feel that is springy and responsive by picking a fin in the 10-7 range, or a solid, engaged, and predictable feel from the Speed Control category rated 4-1. For a Balanced feel try a Ride Number of 7-4.
2 Rear Fins