Sram PC XX1 Rainbow 12s chain 120 links with PowerLock tool free connect system . Design optimized for a lightweight, precise, ultra-smooth and quiet chain. "Hard Chrome" technology allows 4 times the elongation (wear) resistance to other chains. Compatible with all 12s drivetrain systems, 250 gr. weight (120 links). "Rainbow" finishing for a perfect matching with XX1 Eagle AXS groupset.