The PromaxPI-1 Alloy 4545 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, 4545 angular-contact sealed bearings. Because this versatile headset has 4545 angular-contact bearings, you can use the included cups and install it in standard frames. Or, leave the cup in the box, and use it as an Integrated headset. Weight: 124 g

• Weight: 124 g
• Upper Stack Height: 8.2 mm
• Lower Stack Height: 4.2 mm
• Crown Race: 30
• S.H.I.S Lower: EC34
• S.H.I.S Upper: EC34
• S.H.I.S. Stem Clamp Diameter: 28.6 Threadless