Contact Truefin if you feel you have a faulty fin or suspect a manufacturing defect.  Truefin will make things right!  The spines have a limited lifetime guarantee so if a spine breaks simply contact Truefin and arrange for a free replacement.  Truefin has not experienced any broken spines of all fins tested, so if a spine breaks, Truefin would like to study such a fracture and provide an engineering solution.  Computer Finite Element Analysis (FEA), as well as physical bench testing, has been conducted during the evolution of the exact spine geometry to maximize strength while using the least amount of material.  The result is a highly engineered spine which functions perfectly in this application.  Truefin was developed by engineers who are also divers in order to provide a kicking experience second to none.  The user should be assured that there is the absolute expectation that the spines should never break during use.