A fin inspired by the George Greenough 4A, a verstile singel fin. SBS BUTTERFLY FIN: A high performance fiberglass fin inspired by the Greenough 4-A TEMPLATE: Features a stiff base with a moderate rake. With a medium flex and a taper to a moderatley flexible narrow tip MATERIALS: High quality semi-transparent fiberglass SANTA BARBARA SURFING: Based in Santa Barbara, CA we are a small family owned business FREE NO TOOL FIN SCREW: We include our No Tool fin screw and plate for easy installation. ASIN B09CFWSHS2 Color Turquoise Fit Type Regular Brand Name Santa Barbara Surfing Sport Type Surfing Closure Type Pull-On Manufacturer Santa Barbara Surfing Material Type Fiberglass Age Range Description Adult