Silence! Ah the beautiful absence of noise in a quality drivetrain; the fulcrum of the new Campagnolo Chorus 11 Ultra Narrow Chain, silence is a quality that often goes overlooked. Sure you want your bike to shift in fractions of a second, but it needs to be quiet also. Along with being able to hear your tires along the road again, the Chorus 11 UN chain is made with the same special steel outer links and Ni-PTFE anti-friction treatment as the Record chain. The only differenece is where the Record chain has hollow pins, the Chorus 11 has sturdy solid pins.