Another FCS surfboard fin template ridden and tested by Kelly Slater which are enhanced with Uni-Flex carbon technology. Ideally suited to open face waves and longer turning arcs. Designed with Ricon in mind, they"ve been Kelly"s magic set for years. So grab the K3 to help get down the line and the K2.1 if you"ll be surfing beach breaks and barrels. With the two fin sets, you should be set for almost any wave. Comes with three fins and a fin key. 4 .45" base and 4.61" depth.