DT Swiss Squorx Pro Head Nipples.
These nipples are a very innovative product, they work great!
DT Squorx Pro Head® nipples get their name from the combination of a Torx drive head with a traditional square drive body. The Squorx design allows truing from either the back side of the rim (with 6-point Squorx driver), or externally (conventional 4-sided wrench).
Brass vs Aluminum?
Squorx 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.
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These nipples are a very innovative product, they work great!