The Channel Islands template has responsive flex pattern for high-performance power-surfing in good waves. This larger tri fin has more rake with a thinner tip for snap off the top while the wider base for drive off of the bottom.
CIM 4.75" is a large thruster (180 lbs+)
front fin: 4.7" base: 4.6"
rear fin: 4.4" base 4.6"