This is the Campagnolo Chorus 12-Speed Chain. Fluidity. Smoothness. Noise reduction. Campy's 5.15mm Chorus chain delivers the qualities you demand from a chain, and fully meets the performance standards of 12-speed groupsets. The strength of the treated steel links is absolute, and the Ultra-Link(TM) closure system guarantees safety and the long chain life. NOTE: Dear customer, please consider that this locking pin can only be effectively closed with a compatible chain peening tool. Features: ULTRA-LINK(TM) CHAIN CONNECTING SYSTEM: High strength chain connection - greater safety and longer chain life ULTRA-LINK(TM) CHAIN LINKS: Designed to give better performance to Campagnolo(R) drivetrains Greater durability of the gears and sprockets, and maximum efficiency in the transmission of power Solid pins Use chain tool specified for 12-speed chains Specifications: Speeds: 12 Speed Links: 110 Chain Width: 5.15mm Chain Connector: Pressed Pin Pin Type: Solid Color: Silver Weight: 241g