The Polini Hi-Speed Evolution is an absolute high-end variomatic for Piaggio engines with a 14.8mm varioshaft. These variomatics use 6 19x15.5mm variomatic rollers. Two sets of variomatic rollers are contained, so you can choose between 3.8 or 4.3g. The kit also contains a new counter pressure spring and an Evo-slider for reducing the friction between the spring and the convertor plate. Polini even brands the Hi-Speed Evolution as the best on the market. 100% made in Italy.