DT Swiss QR x 135mm 6-Bolt Disc Bicycle Rear Hubs
About DT Swiss - Driven by the vision of becoming a worldwide known manufacturer of bicycle components, DT Swiss expanded its product range over the years. Today DT Swiss has established itself as a leading manufacturer of spokes, nipples, hubs, rims, complete wheels as well as suspension systems.
QR x 135mm, often called QR or Quick-Release mountain / hybrid standard.
This should correspond to the type of brakes you have on the bike.