DT Swiss Squorx Pro Head Nipples
DT Swiss Pro Lock Standard Brass and Aluminum Nipples use a patented fluid locking agent applied to the threads to prevents loosening under extreme vibration.
Brass vs Aluminum?
Aluminum nipples weigh about one-third the mass of a brass nipple making them a great option for weight savings at the rim/spoke interface.
Wheelbuilder does not recommend using alloy nipples in wet or salty environments due to their limited corrosion resistance.