The QD2 3.75 Blackstix is a small size quad rear with a Ride Number of 8.1. Looking to turn your favorite Thruster set into a Quad? This pair of Quad Rears can be combined with any Futures front fins to suit your riding preference, board design and waves.

With an 80/20 foil, these rears are a mix of response and control. They will favor boards that have the rear boxes set closer to the rail, away from the stringer.

Size - Small ( 48kg - 70kg ) 
Ride number - 8.1 (Speed Generating. Springy. Fluid. Responsive)