Future Fins JC1 Vector II Blackstix 3.0 V2JC1 Thruster Surfboard Fin Set Carbon Fiber The JC1 Blackstix was designed by John Carper of JC Surfboards as a springy fin with a V2 foil for the powerful surfer looking to build speed and drive in smaller waves. The JC1 is a traditional template with a refined base that carries through to a fuller tip, which is meant to hold through turns.