Replacement chromed steel track hub nuts, from Shimano. These are the nuts fitted as standard on the Dura Ace NJS hubs. They are the best quality, and will not rust! Also suitable for use on other Japanese or Taiwanese hubs, like Suntour, Suzue, Gran Compe, Formula, Sansin, etc. These are not suitable for use on Italian hubs like Campagnolo, and Gipiemme. The price is for a pair of nuts. Front nuts are 9mm and Rear nuts are 10mm.