F6 Honeycomb (US Base) - Single Fin - Futures Fins US
Inflatable SUP US Fin Box with PVC Patch | Green Water Sports
Essential Single Fin US-Box Classic - Second Wave Surfing Shop
4.5" US FIN BOX Speed Center Fin - BLACK
Fanatic US Box Centre & Side Fins - SUP | H2O Sports | H2O Sports
Air7 fin box for inflatable SUP Genuine fits most US Box fins, includes glue | eBay
Amazon.com: 4.6" US box center fin Safety Flex Soft replacement for longboard SUP Stand up Paddleboard River Surf Whitewater airSUP AIR7 Skeg with optional 'No-Tool' Fin Screw (Black (no screw included)) :
Are Paddle Board Fins Universal? [What Is A Fin Box] | The Seasoned Surfer