Cane Creek 10 Series Headset Bottom Assembly EC/49/40/H12/K 76.6g MFPN=00.4021.025.018 the drive side cup is

the drive side cup is left-hand thread and the non-drive side cup is right-hand thread

This SRAM XX Eagle T-Type aluminum impact/bash guard kit helps to protect your XX chainring when riding on rough terrain

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Prolink® Shift-In Binding included

Cane Creek 10 Series Headset Bottom Assembly EC/49/40/H12/K 76.6g MFPN=00.4021.025.018 the drive side cup is10 Series Solutions: separate top and bottom headset cup assemblies for tapered, reducer and conversion applications (mix & match system helps reduce inventory overlap) Same features as the 40 Series headsets with simpler machining and more economical materials Top assemblies include star nut and top cap, while bottom assemblies include crown race TECH SPECS model 10 Series lower S. H. I. S. EC49 40 upper lower lower stack 12mm color black weight 77g