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Blue spines (which flex twenty degrees 'toe up' and sixty degrees 'toe down') are available for purchase, but Blue spines are provided as standard equipment with all Truefins, and all spines (Blue, Green, and Yellow) are covered against breakage with a limited lifetime warranty. Nevertheless, some users may wish to preassemble customized spines to have onhand. Individual Blue, Green, and Yellow vertebrae may be mix and matched as desired when customizing a fin. In some instances asymmetrical blade flex may be created which thereby creates a right and a left fin.