Cycle Group PX-HS1300PI1-BL Promax PI-1 Alloy Sealed Bearing Press in Headset, 1-Inch, Blue Available in anodized red, blue, gold and black, in 1" and 1 1/8" sizes Because this versatile headset has 45x45 angular-contact bearings, you can use the included cups and install it in standard frames The PI-1 Alloy 45x45 headset has an aluminum top cap, upper bearing cover, lower race and upper and lower cups All-aluminum construction results in a lightweight headset Each headset is fitted with super-smooth rolling, precision, 45x45 angular-contact sealed bearings