Surfboard by 7 Surfboards. Superfish 4 A 7S composite surfboard such as the 7 Superfish models distributed by Global Surf Industries is built using a lightweight Expanded Polystyrene (EPS) foam core fused with epoxy resin and reinforced with high-strength woven composite cloths or carbon stringer alternatives.Core and Construction MaterialsEPS Foam Core: A lightweight, fused bead polystyrene core that provides high buoyancy and volume while keeping the board very light.Epoxy Resin: A high-strength liquid plastic used to laminate the outer shell, offering superior ding resistance and flex rebound compared to traditional polyester.Specialized woven hybrid cloths (such as Innegra or multi-axial fiberglass) and carbon fiber stringer replacements running down the center for structural strength without adding rigid weight. 7" x 21 1/2" x 2 13/16" Lightweight and easy to duck dive. Because of the above description there is very little damage other than a couple of yellow spots. Great board!