The Timmy Patterson Twin is a well balanced template pivot fin with a wide base and full tip for a balanced and predictable feel.  These work great an most twins.
 
These fins are with Futures fin boxes  
These fins are compatible with FCS-2 fin boxes. *Fin Screws included for secure fit*
Twin
Base: 5.29
Height: 5.45"
Area: 21.15 in²
Rake: 32.5°
Foil: Flat
Material: G10 
Stabilizer
Base: 3.44"
Height: 3.35"
Area: 8.30 in²
Rake: 29.0°
Foil: 50/50
Material: G10
 
 
Cant angle for Futures based twin: 6.5 Degree