Channel Islands Al Merrick Keel Fin Make no mistake, this fin ain't retro. Although inspired by classic keel outlines, the all-new AMK template boasts a modern rake shape, graduated tip flex and flat inside foils finely tuned for fast, high-performance surfing. This keel-fin set is built to rip but also ideal for those that just want to groove. Dimensions: Height | 5.15” Base | 6.46” Area | 25.54”