( 1 Fin Set ) Futures Compatible: The PT-1 was designed to replace the third fin in your thruster, or it can be added to your favorite twin as a trailer. This concept will supply added projection as well as a loose, free, and energized feeling from a trailer fin. The PT-1 features the unique stiff leg and paddle flex characteristic similar to other Greenough designs which will liven up the response from your board. This fin is specially constructed from a proprietary blend of unidirectional epoxy laminate produced under high pressure that allows for optimal and performance.