The D.I.D - JT drive and chain kits for papis contain D.I.D Japan 420D or 428D drive chain - which have 20%-50% higher wear resistance - thanks to the use of Solid Bush pin technology, which is made of a single piece of metal and guarantees a longer service life compared to simple drive chains. JT sprockets are made from Japanese High Carbon C49 steel, the most durable available on the market. The combination guarantees excellent performance and trouble-free mileage.