The Medium FCS II Performer Neo Glass Tri Set excels in all different conditions and has a solid balance of speed, flow and responsiveness. Recommended for all board types, these rear fins use Inside Foil Technology for a great mix of drive, pivot and hold. Great option for surfers of all levels as well as conditions and board types. The medium size works for the weight range of 65 - 80kg's. Included are 2 rear quad fins to be used in conjunction with two side thruster fins, sold separately.