This is the Mayhem Evil Twin + 1 by Futures. This set has been designed for the Lost Mayhem Evil Twin board model but it can be used in any twin fin. The template was inspired by a mid 90's hand foiled twin fin set created for the original RNF. It has a fair bit of area and is quite swept back. They are upright twins and will offer both pivot and drive. Use the trailer for more stability and control during drawn out turns and while surfing bigger waves.