High quality HM nipple washers from Sapim.
HM washers reduce the friction/wear between nipples and rims. They also help to reduce galvanic corrosion between carbon rims and alloy nipples.
The 7.2mm outer diameter fits almost all rim holes.
Outer diameter: 7.2mm
Hole diameter: 4.5mm
For use with 14g (2.0mm) spoke nipples.