Brass ring with black rubber seal. This model is for carbon frames that have an outer headtube diameter of 58mm. This ring is required for proper spacing at installation of Lefty and Headshok steerer tubes and stems.

This is the middle of the three sizes in outer diameter. Fits most carbon frames, but the biggest size (QSCSEAL) fits the biggest headtubes.

Kit includes one upper bearing seal. 

The last 3 Pictures are for comparison only