Lightweight laminated transluscent fiberglass for a super stiff construction and clean looknFoil Design: medium base = good drive, medium height = good grip, low sweep = highly maneuverablenMounting screw and plate includednFits all standard longboard fin boxesnCompare to other top brandsnThe high performance culprit long board center fin combines an excellent balance of base, length, height and sweep to produce a fin with good drive, grip and optimum maneuverability. This Culprit center fin is constructed of tansluscent laminated fiberglass resulting in optimal fin stiffness, flex and style. The use of too much glass in the fin results in too much weight. The use of too little reduces the stiffness and strength and affects the flex pattern severely. The flex pattern in surfing can seriously affect the way your board and surfing performance. Culprit ensures high quality materials and precision fiberglass placement to yield optimum strength and lightweight.