Ritchey:

The Ritchey External Cup EC Threadless headset features a smaller upper bearing to save weight, while the lightweight, precision-machined aluminum cups are deep for solid insertion.

Material: steel
Threadless
Stack height: 29.8mm
Stack height upper: 16.8mm
Stack height lower: 13mm
Headtube ID: 34mm
S.H.I.S. upper: EC34/28.6 (1 ?)
S.H.I.S. lower: EC34/30 (1 ?)
Bearings: semi-cartridge (SSC)
Top cap included
Weight: 146g
Colour: black