12 mm Thru x 142 mm SRAM XD 11-Speed Black Center-Lock Disc Bicycle Rear Hubs
This is hub spacing and is the width of the hub. It must match your frame specifications.
The cassette body type is the type of cassette and number of speeds the hub will accept.
We define color as the main color of the item. It may have accents or highlights in other colors.
This should correspond to the type of brakes you have on the bike.