Beware of COUNTERFEIT XTR chains, they are epidemic online (EBAY and AMAZON) costing $45-$60. A genuine M9100 chain is minimum $90 at any shop.
This is the genuine hollow pin chain with reputation for long life and toughness. This is clear when sizing it, the pin is very hard to break with chain tool. Used with low use from a parted out bike that used a 34 x 51T drivetrain, clean and strong. Genuine Shimano. Sized to 118 links, comes with quick link.