Cane Creek 10 Series Headset. Features: The 10-Series has the look and feel of Cane Creek's class-leading 40-Series headsets with simpler machining and more economical materials Designed with the upgrade path in mind, the 10-Series shares the internal geometry of Cane Creek's higher-end headsets and, as a result, replacement and upgrade parts are readily available 6061-T6 aluminum construction, sealed, lightweight polymer crown race and compression ring (Interlok spacer compatible, sold separately) ZS (ZeroStack) and EC (traditional External Cup) models for 1-1/8" and 1.5" steerers Internal parts are cross-compatible across the 10, 40 and 110 series