The Shimano CN-7901 Dura Ace 10 speed chain improves when it seems like there was nothing left to improve. The CN-7901 chain is lighter than its predecessor and features a new link design that decreases the work it takes for the chain to move between sprockets. This new link design makes shifting faster and smoother. The Shimano CN-7901 Dura Ace 10 speed chain is recommended for use with Dura Ace 10 speed drive trains. This chain set includes 1 connecting pin.