These are a great, highly affordable set of medium sized thruster fins to get started with or as a back up. The are a moulded composite surfboard fin with engineered flex and tip response. The template is a neutral, all rounder, features inside foil technology and is designed to provide a balance of speed, drive and response in a range of conditions and surfboard types.  M5 suits 65kg-80kg riders
Features:
Fin base: FCS I (aka dual tab)
Surfer weight range: 65kg-80kg
Construction: durable plastic composite fin

Fin specs:
Base: 4.37
Depth: 4.55
Area: 14.76
Sweep: 33 degrees
Foil: IFT