Industry Nine 12 mm Thru x 142 mm Shimano/SRAM 8/9/10; Shimano Dynasys 11 Rim Brake Bicycle Rear Hubs
About Industry Nine - "Industry Nine hubs are handmade in Asheville, NC"
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.
This should correspond to the type of brakes you have on the bike.