The PRO Vibe Spacer Set 1-1/8" is an aerodynamically optimized design headset spacer system designed to be used with PRO Vibe stems and 1 1/8-inch round fork steerer tubes. The kit includes 4 spacers of various heights and a top of stem spacer which works well with various headset top caps. These precision cut alloy spacers add a bit of aero efficiency and finish a clean visual effect with the PRO Vibe stem design. Sizes are clearly marked.