Double Square aluminium nipples.
The Double 4-Kant (double square) head allows for tensioning of the 
spoke from either side of the rim, a big advantage over traditional 
nipples is that the wheel can be built without the visible surface of 
the nipple being damaged, they also allow for better align with the 
spoke and helps prevent excessive buckling of the spoke while lacing.
This head style adds 4mm to the overall nipple length, so an 18mm 
nipple has an effective length of 14mm and the 16mm has an effective 
length of 12mm.
These nipples are designed to help with centring, and can be used for hand lacing. 
Tech Specs
- Material: Aluminium
- Discipline: MTB, Road, Trekking
- Thread diameter: 2mm
- Effective Length: 12mm/14mm
- Overall length: 16mm/18mm
- Colours: Blue, Green, Black, Orange, Red, Purple, Gold, Silver