Campagnolo's Record 10-speed Ultra Narrow chain is just 5.9 mm wide. Owing to its dimensions the new version is lighter and quieter and facilitates adjustment of the rear derailleur. Chain links and pins are hollow so that the chain weighs only 255g in total. The tests run in Campagnolo's specialist laboratories have shown that traction force pin retention force wear resistance to stretch torsion and flection are the same as for the generation of 6.1mm wide Record 10 speed chain. Technical Specifications: Suitable for any Campagnolo 10-speed groupset Ultra Narrow design 5.9mm wide 114 Links HD-Link system for high strength link locking - greater safety and longer chain life Silver Colour Lightened links Hollow pins Nickel-PTFE anti-friction treatment for reduced friction smooth pedalling quiet operation greater efficiency and longer chain life Requires Campagnolo HD-Link Chain Tool for installation Weight: 255g 114L