Tune Magnesium Headset Spacers
These headset spacers from Tune are a great lightweight and understated alternative. The thin magnesium body shaves weight over aluminum and then sheds even more by removing excess material. The inner surface rests on three flanges to fit a standard 1 1/8in steerer tube. Three sizes help dial in a perfect fit. Available in 4mm, 10mm and 15mm sizes.