Aerozine CNC Machined Headset Spacer Kit - 5mm/10mm/20mm - Green
The Aerozine spacers are CNC machined from 6061-T6 alloy to create a scalloped profile and a smart touch is that the shape is maintained throughout the size range, e.g. the 10mm spacer looks like two 5mm.
At 15 grams for all three, these are strong, light and good looking spacers.