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The xTuf S shaft is a unidirectional carbon fiber shaft designed to maximize stacking (progressive stiffening of the shaft as it flexes). It's a lightweight shaft that tests at approximately 80 KFI (Ke Nalu Flex Index). Perfect for any racer with shoulder or joint problems or surfers who like some flex but who favor paddle control over flex. These shafts are strikingly beautiful, with an iridescent shimmer of silver grey that is a natural result of the sharkskin texture and the deep black of the unidirectional carbon fibers.