The Lovelace FM Twinzer set was specifically designed to be paired with Ryan's FM board model. The front nubs have a single foil with a flat inside, while the rear twin design features a double 50/50 foil. This unique set will provide lots of speed, drive, and the ability for heavy rail carves and fluid arcing turns when paired with the proper board. Here are some more design notes from Ryan...

"These fins were designed specifically for the pretty oddball placement of my FM surfboard design; over 2" off the rail on mid lengths and nearly parallel; either with or without the leading fin depending on the rider's preference.  The overall template plus the fact that they're double foiled aims them pretty definitely at midlength twin designs, drawing connected, arcing carves.

( Front Fins )
HEIGHT: 1.63" / 42.5 mm   
BASE: 3.33" / 84.5 mm
AREA: 3.70”² / 23.87 cm²

( Back Fins ) 
HEIGHT: 5.66" / 144 mm   
BASE: 5.84" / 148 mm
AREA: 22.46”² / 144.90 cm²