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| FCS Fin Size Chart | Fin Size |
| Under 120lbs | XS |
| 140 - 155lbs | M |
| 165 - 200lbs | L |
| 190lbs+ | XL |
| Futures Fin Size Chart | Fin Size |
| 75 - 115lbs | XS |
| 105 - 155lbs | S |
| 145 - 195lbs | M |
| 180lbs+ | L |
| Longboard Fin Size Chart | |
| Board Size | Fin Size |
| 6' - 6'11" | 6" +/- |
| 7' - 7'11" | 7" +/- |
| 8' - 8'11" | 8" +/- |
| 9' & up | 9" +/- |
$80.00
The QD2 4.15 Blackstix is a large size quad rear with a Ride Number of 8.1. *Includes only 2 rear fins. The QD2 4.15 Blackstix is a large 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.
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