KMC X12 chains feature a double X bridge shape for fast and smooth shifting. Features: Compatible with SRAM 12-speed systems Double X bridge shape with inner and outer plate chamfering for smooth and fast shifting Mushroom riveted pins for the highest pin power and allows shifting under heavy loads Specifications: Speeds: 12 Speed Links: 126 Chain Width: 5.25mm Chain Connector: Missing Link (Single Use Masterlink) Pin Type: Mushroom Riveted (Solid) Color: Gold/Black Weight: 268g