Lightweight and precisely parallel to keep the fork/headset/cockpit secure and smoothUnidirectional carbon fiber construction (no visible cross-weave) with a white Zipp logo to match other Zipp UD-carbon componentsSet includes 1-1/8 spacers: 2) 4mm, 1) 8mm, 1) 12mm, 1) 30mm Mfr#:00.1915.124.010