Replacement surf fins
Fins, tees & wax
Lost or broke one fin? Buy just that one. Every Butterknives fin is sold on its own: left front, center rear or right front, on a dual tab base for FCS1 boxes or a single tab base for Futures boxes. €30 a fin.
Replace one surf fin, not the set
A thruster has three fins: two side fins (left front and right front) and one center rear fin near the tail. When one breaks or goes missing, most brands make you buy a whole new set. We sell every fin on its own, so you only pay for the one you lost.
Which base do I need?
Look at the fin boxes in your board. Two small plugs per fin is FCS1: choose the dual tab base. One long, narrow box per fin is Futures: choose the single tab base. More in which base do I need, or send us a photo through the contact page.
Does it fit fins from another brand?
A Butterknives fin goes into any FCS1 or Futures box, whatever brand the other two fins are. With Butterknives in all three spots, every fin shares the same shape. Butterknives for FCS II boxes are not available yet.
The fin
Every Butterknives fin has a honeycomb core, a medium flex, a wide base for drive and a slightly bolder tip for grip. It is 117.1 mm wide and 122.3 mm high. Three designs: Detained (solid black), Condemned (striped black and white) and Suspected (solid white).
Shipping and returns
Orders ship from The Hague within 1 – 3 working days, with track & trace. Shipping is €5.99 to the Netherlands, Belgium, Germany, France, Luxembourg, Austria, Denmark and Italy, €9.99 to the rest of the EU, and free from €60: two fins ship free. You can return them within 14 days. See the shipping policy and refund policy.
Starting fresh? Choose a thruster fin set or build your own in Pick your poison.
The Butterknives system
Lose a fin, replace one fin.
Snapped your left front? Order that one fin, not a new set. Every Butterknives fin is sold on its own, so you can ride any mix.
Honeycomb core · wide base for drive · bolder tip for grip



