A JT «underbone» Drive Set with an HPO O' Ring Chain and JT sprockets for the MODENAS DYNAMIC 125 2005-2008. JT sprockets are made from top-quality steel — the rear ones in C45 hardness by the heat induction method, and the front ones in SCM (chrome-molybdenum) steel alloy, fully hardened. The black colour on the rear one adds Extra mileage "endurance" (a ZINC coating) and, combined with the high-performance gold JT O'Ring drive chain, they guarantee more than double the number of kilometres compared with a normal drive set. They are the ideal solution for the professional but for the ordinary user too. Available straight away for the majority of the underbones on the Greek market.