These longboards are made from a thermoplastic core and an outside shell that is made from a carbon tape. 3 Ring have tested these decks in some severe situations (dropped from buildings on their noses and run over them with cars) and still have not been able to break them. The decks are also waterproof. They are available in three different flex ratios: T3 heavy, T2 medium and T1 Lightest. 3ringlongboards.com