Standard aluminum nipple with 12 mm effective length. The head shape allows the nipple to better align in the pulling direction and so prevents excessive buckling of the spoke. Double 4-Kant (double square) nipples designed specifically for Centering, but can also be used to Handspeichung. This nipple shape allows for tensioning the spokes from the inside. A big advantage over traditional nipples - the visible surface of the nipple clamping surfaces will not be damaged. **Tech Specs** * Material: Aluminum * Scope: MTB, road bike, trekking * Thread diameter: 2 mm * Effective Length: 12mm * Overall length: 16 mm * Colors: Blue, Green, Black, Orange, Red, Purple,