Fin configuration: Three on each end. One 0.8" aluminum P-Wing center fin and two molded-in outer fins. Construction: Foam core, layered glass integrated from top to bottom, synthetic snake skin top. Company comments: The Syn series rides higher in the water than any of our other three-stage boards. The Fret Rail Design allows the board to set a quick turn and has less friction on the water. This is our most universal three-stage rocker. A softer women's specific flex for progressive female riders. Fret rails don't sit as deep in the water as step down rails or flow thru rails but still initiate a fast edge into the wake. Molded-in fins with the deepest point close to the trailing edge that allow the board to ride stronger up and into the wake. Cupped rails give a quicker grip into a rail-ride turn. Smooth forgiving 3 stage pop.