The NeroUno Duetto maintains the now unmistakable octagonal design with a conical effect, a distinctive sign of the collection, but is dressed in new inspirational details such as the cap with linear engraving, made entirely of shiny metal with cubic zirconia cap top, Montegrappa logo, remains the inimitable signature of excellence. All Montegrappa writing instruments are guaranteed against any manufacturing defect for 24 months from the date of purchase. Any part of this pen with even the slightest manufacturing defect detected by our authorized customer service department will be repaired or replaced under warranty. To benefit from the international guarantee, simply present the international guarantee certificate, correctly completed by one of our authorized resellers, complete with stamp and date, to one of the Montegrappa assistance centres.