The K1 Keel fin is Future's classic Keel Fin design. The Honeycomb core with the classic bamboo inlay give the K1 a medium flex pattern and the big, old-school template generates rail-to-rail speed down the line and provides hold through direction changes. The K1 Keel is the iconic match up with your retro-fish.
A lightweight hexagonal core gives these fins the feel of glass-ons. Engineered with a medium flex pattern, these are stiffer than Blackstix but more flexible than Fiberglass.